Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcf36841694fcd0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 11:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd30a95d55a2d9afeea659ac917ea81e SHA-1: cfe6787b2863bb41ff29a9f109a6115d4a23c408 SHA-256: 5fcf36841694fcd0952b8ea0b1beab3f37f66ce4e12cb52ec371173451a6e876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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 https://garglob.ru/uplcv?utm_term=railway+apk+download PDF link annotation
    • http://thanhtindesign.vn/uploads/image/files/84136528110.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/wibeximolaruvujuk.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146bb916ab51---94393607761.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/kanumepu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6596a69---divemebub.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23047073475.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f664b1c247---zitavuj.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/64589159806.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/84878551392.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4803f37c580a9e26ff65fc4a88eba601/nogeropagowow.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0bf1cecd---72559541995.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/janeva.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/98760466091.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/rifaxovofagimajinesuwidur.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/29770668471.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/siluzin.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/ganaj.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/lasimuwivevira.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/rorefidexonib.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/6861824647.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440704ba73c---sexoxigowaromugikokosema.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/tosajosexevafovesoxiwufa.pdfIn PDF document text
    • 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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 10224 bytes
SHA-256: 9fd1753de0510808cfe810a40b041330731853f3e2551366163b917910c40500
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 18336 bytes
SHA-256: 04c33fb3650a29f5d2cc78b4d3ef3afac123dd23df2c8aa8be62b49f8395dc6b
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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