Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeda2cefec400a51…

MALICIOUS

PDF

80.6 KB Created: 2021-06-18 06:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 000fc86658c526f6db790f33567e08c3 SHA-1: 5a7fda35ba92b91e9ab8fa076986f736595784df SHA-256: aeda2cefec400a518328b99d107c2af45201db68d84ac5a5d3964320459c9759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b483cf961dc---83984477736.pdf In PDF document text
    • http://1utilaje.ro/mm/file/sidud.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/mamemajawuvife.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077a63715a91---23744205427.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bokavebogewopes.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074777b82332---35662686466.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/3869352655.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891a8aa8bc8---23638158799.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a53d6e20c4---wisogo.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5b08ca37ebc6b140b8a8a8a99752148d/fixufuriko.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/519fc1963288100a559cc77745ed3bee/zadutotezipomufiri.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/58295314743.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/57623157309.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3875d85463---pojipunepugefun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=amigurumi+penguin+pattern+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 5000 bytes
SHA-256: bdaa1f7214c7f93b4c13c28e45daaa9874bcc5edc1e9f117a3a6af3197538f2a
font_01_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 10780 bytes
SHA-256: 788b7d907e464f53299baa89cc7f56cf7f20a9ca81185966b44adbee7ce07298

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