Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb2b54ecff32c43…

MALICIOUS

PDF

78.4 KB Created: 2021-08-09 16:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b79d816ce27204bb3e1db3b829eda21 SHA-1: 310e6729aabbcb52c9e2266ba52bdd4253d55d42 SHA-256: fbb2b54ecff32c43626ece98512a0786dc8e44c56c5cb46bf0ab21471c2033f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff24450aac---68990011223.pdf In PDF document text
    • http://iseveranscopy.com/upload/editor/file/2450671295.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160912e2eacd29---ruvuweva.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/28282045872.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/149e347467e34bb4d364059cc71a40aa/kixefilelukenotizuxot.pdfIn PDF document text
    • http://clarasonic.com/upload/file/29063470071.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/bolusefuvaxebino.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa050257d1---36952254190.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/zevepevugojojubu.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/sovajazukabebarimulor.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ip875pralro9jlatrpvajlm7fj/60763385479.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/6703368500.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4962129f98e7db4011ad4aa4eff0b1c4/20353897233.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/lavofoviv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a786e1195bf---dulilenosojumafiliko.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/28836740015.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/40089699959.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/88670315517.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6b84bef85db50ad06ee42a447803ea7c/fuvozarazafe.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/kunamevadukuxozetogerobaw.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6208d1f527e92f849008a320a3df6da1/10598837552.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/41490420688.pdfIn PDF document text
    • http://soupworld.de/upload/file/getirulividisanusojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=amway+espring+water+filter+changePDF 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_off0000cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 10988 bytes
SHA-256: c35cad5f166bd2522d75a4d53870a59f19bb03339a028d8aea3ec50f7543d02e
font_02_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 17260 bytes
SHA-256: 2f1c61e43d8abf74a638ca4dc354e29bf54d48aa379f05dbf0c810eeb7b98f8d

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