Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afd472fb82ab7c2…

MALICIOUS

PDF

93.2 KB Created: 2021-07-18 00:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 836610bd3777fc09d0b65c3601a564bd SHA-1: 95557d97c0e610f1a31afb939e8120ca56bd19ab SHA-256: 5afd472fb82ab7c2d430d916a00ae3f94bc4b98fb47535e7f77bd0e420902f4a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.look4job.gr/images/_user_na/file/10936794463.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105139d0a1---gaxotipimiko.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62f6570ea---29992446234.pdfIn PDF document text
    • http://com123.vn/uploads/file/93125596294.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/942278e0b8bdbf1ff97545d61b308078/22087437346.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca78d6e42---bubonuletu.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.pdfIn PDF document text
    • https://ovalpolycoats.com/media/nepawuwibezi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/majoxog.pdfIn PDF document text
    • http://adreshosting.com/calisma2/files/uploads/mezesefowokavefedakuz.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/99079237652.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838f020907f---rapezaragodajigokuwizerum.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1c669321---vugukosilajolu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/srkvc0r7i99bicomrdo3tg9fl5/sopezaworadesemez.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a597d53fa---39135419501.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d553b9616e---57277796986.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/81872102530.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/39481118707.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0f19f58e4e8bab5961c98e784ec947f1/97514041431.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169299a173---60388519173.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2621af65---23871725718.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/26a5a34508e02f612082ca9211485e3f/36075824591.pdfIn PDF document text
    • http://clarasonic.com/upload/file/25771859298.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2r8idpn5gajgbculbqvsjo4fbl/vexizudodovifizijesu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269434199e---15832692742.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/79da434e2457860a28d817f320b7f572/xabozabatefefekide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pitcher+meaning+in+teluguPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 2008 bytes
SHA-256: 06571f90440c94ac149a9009aa572c8e8abb417426809fd285dfad209a27d647
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 10488 bytes
SHA-256: 2985d170a468472efc354de4a52a31c98ad763b81b6372de18e6b1a65647c46e
font_02_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 19628 bytes
SHA-256: 87d8feb32e89e1c81b31f7014a9085d1105ee025a08d8680f2bbbb9085b99315
font_04_sfnt_off00014c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C32 17264 bytes
SHA-256: e747c6c9b4581fbe4de6488816ffb8e828bee848fbb889f5a888a7c9cba9fb08

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