Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa5321735119476…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 16:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 838fa521855fcf91d6435563cc8a94c9 SHA-1: 73475bc2dfa83a0d0369f262677c06608cb919ea SHA-256: 0aa5321735119476f1c0922d397e0de72e01bfc13319cc5bdbe0d2215383b588
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised WordPress uploads and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest a multi-stage attack where this PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://curry-box-deluxe.de/userfiles/file/39702643575.pdf In PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/78242630029.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/39901447945.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4ac0bb4ea2ff4c80245a46062e8b6818/gejoxojumifemivubofozila.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/15b26783b33bd6103f14da06fccffe3c/59084275006.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/wulusutakob.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b6338e80af2---luxijebivewevibod.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/10255404249.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/rurasuwaxalilelirisivum.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/57139571750.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/4094066672.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/rumafetiko.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/27619403038.pdfIn PDF document text
    • http://erex.hu/upload/file/48502698308.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a16c9b93c029fa9e1a1fd2c16727a0c1/43601513058.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/48585393422.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d22572f4---60629859640.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/71878993910.pdfIn PDF document text
    • http://rentaruedas.com/files/others/mojosogomu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa0d52548---janadukitotoberinugisa.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/7cd13da776afe5a7e49481d4bfc548d7/95333495211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=a+screw+jack+nut+is+not+subjected+to+which+type+of+stressPDF 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_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 19116 bytes
SHA-256: cac335402fd9bb9c6406bcc4e1d4cd73ee4afcc657d34ed3be118a51f0b67778
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 11316 bytes
SHA-256: 1a8c0ec91edfddf6ca5c038adae0946277237af0330e134b4f63fb28d884facd

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