Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fd57cffcbef71a…

MALICIOUS

PDF

116.1 KB Created: 2021-09-06 05:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00549b18a44a2b43d35764c37bc693e6 SHA-1: 877631ab160a6fdeff6c943ac102e06da071e997 SHA-256: e2fd57cffcbef71a7f1a643ca4c36c4d43157d5b1dc2c789327fe3d91270c90f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests the PDF is designed to redirect users to malicious or compromised web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://aadhaarretail.com/administrator/imagetemp/file/tazilufojojinopelipef.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a122c5fa6---wumugopiri.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jlr1ds6fegvqvu2s95lnt4obsr/56611818597.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6b5e227a500030c3e76f737783edd683/botuvedafem.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/wuvagupiduripejusuzufesuv.pdfIn PDF document text
    • http://asvpp.fr/pdf/3492992360.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mos4qftmnl32hfl2hlet0rv64d/vapuzabafimonovo.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/jokadakifewozijisuze.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f4b7453230de6fa61d9d40b235111f50/daveg.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/elpjgi087ah8bkg6t3a3enl5j2/78002097064.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/16532723772.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///96221179042.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160982c37e9c33---wizudukijugojivunulob.pdfIn PDF document text
    • https://dm288.com/slicice/file/zufuvuzuzutupezi.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/36361227066.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/13523202458.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee8dd5039---zemovivamif.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3ae71c44619af8daf01f062c09f3b621/kogame.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5kpcjhnk4vkqj64t3tfpt0voi4/dopusonigarotumoxi.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/relevolivafurenabami.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4c43888142b0199356557a4e21e2f432/robubokiwujubigek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=indigofera+tinctoria+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_off00015a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001723a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723A 10532 bytes
SHA-256: 372416a8d7e572e6c9fe3bfebcb7a28c08e0490e626c63e3a9e6af59c3e1cc0d
font_02_sfnt_off00018a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A1A 22128 bytes
SHA-256: 8022febca3c4b644ba66c9f723f1963e41c03902cd03328951c9de296834b76b

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