Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52bf944c8c3c1f7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91d9356f92ecc3892db9f9d776dd9520 SHA-1: bad8cdd0785834c95e3da80b6a4f043d9b7c96da SHA-256: f52bf944c8c3c1f7178c81e70548b3f5dd560b41cf0f59b336e1843c8f4c898f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially leveraging JavaScript for obfuscation or further execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ruresept.ru/files/file/rexifobaxototakulezi.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/k52r3jajlutajldni6e5g2tsmh/tujebuvoxabutujejoka.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7c8ec248e2e5280cce2d486b56f64f1d/zetovadexatu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16112a0e07e395---rapatomepixasinikuje.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cmng19263moib4a3m47eebsh0g/19915996962.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/65652889674.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/rulemixogogi.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/tevolodajoxufekos.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/34070370030.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a128629f7a1---10635824424.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jelajozibimimisarolis.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80d4e2877---reradurufarizakipujamo.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/pebaxipewadulisemavobe.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/sasisilagugatigol.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/lunagemesak.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/93156435952.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fivepezo.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/tesivufuxapitekelok.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddd085bac4---68164779704.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/50496983348.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/86915864360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=comptia+a%2B+1001+and+1002+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 18332 bytes
SHA-256: 1931bd933f78174616ffe32eb531018cb2e08aaad838d5033d003bdd7f4abd15
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 10536 bytes
SHA-256: b4ea89332a15b0a442c55fe8bd51a4f65271288a2964cfa1a39969cee7d0d619

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