Malicious PDF — malware analysis report

Static analysis result for SHA-256 897462626b4e80d3…

MALICIOUS

PDF

88.9 KB Created: 2021-08-18 21:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da05eaaf6c3c14d50ff3accd80c79e9a SHA-1: 01b1dd939fdeb9cf3667f8077bb8026968ddda95 SHA-256: 897462626b4e80d3a39ae364e4012d5c8d02cac727c932a1cba342cb41f178e7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098af6e9aa32---boxosovefulurunin.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99b8f3551---jujuz.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/29184903958.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610afd82e7558---63133517767.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/jenijatolelomipasaka.pdfIn PDF document text
    • http://cristalensi.com/public/File/77674256122.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d88f9a3618877d77f543cb248c7d4eb5/15806775379.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5a12cf65---digukipo.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/14823086203.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/af315ce06e162eb76c5283c49cec0c8b/91399654174.pdfIn PDF document text
    • http://www.polni.si/Images/files/fikagidabuneji.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/c7l2lrgh2itriqvh1dtnovstnm/porefovojufegadir.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d7eb89db---98746252870.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/vumuvinefupu.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/fopam.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pakubogobefagopevarajoge.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021846639.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/rewuxela.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/noramepuzizofenakazow.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607752d401369---79753467850.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/dibubezeg.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077feeb4e12f---35267687964.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/sivexisuzikururidufiwi.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kugun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+job+search+skillsPDF 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_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 10580 bytes
SHA-256: b15eddb6022aab413a4be14ccc9d92de02b7f15db8f522b0671f6b796b46fb50
font_01_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 17132 bytes
SHA-256: 3526a8cbd4d8e709c611e0938ced2b487036b39c0ec1088e0a8ba41b31231764

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