Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a459d765d00b1b1…

MALICIOUS

PDF

61.4 KB Created: 2021-06-22 17:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 61f93c14b3702484befc3dd051d7f20d SHA-1: 4a679e45aa8ee0e45e72b68b396cc653164af276 SHA-256: 5a459d765d00b1b1d096954a35e6dea0ce0136eaaa80d84cb3c208c7987e2f7f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute further malicious content. The document's content, though heavily obfuscated, appears to be a lure related to 'Microsoft outlook user manual', aiming to trick users into clicking malicious links.

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 https://ketchas.ru/uplcv?utm_term=microsoft+outlook+user+manual PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b8a3d83f4e484abcdcc31303395c37f4/buregenexep.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b67d35fe---23775387528.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/zezezebeg.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/vonakuvelanisuver.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7c7b855467fa3f6c95ec345342fc1d48/55114354254.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/39060733220.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/20a5dae6959a3665791e600404197339/34062409206.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9ceabf5d---zalobi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d558a33e0---bisemobapixafetexe.pdfIn PDF document text
    • http://vce34.ru/attachments/file/45401628143.pdfIn PDF document text
    • http://screen.by/images/file/pinefijeditiroguwebalogu.pdfIn PDF document text
    • http://guowangcable.com/d/files/65066128320.pdfIn PDF document text
    • https://argumentua.com/i/file/34468458464.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607280a63656a---75778039896.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd6935452---gigewal.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jotokusedebimupetiwilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB582 5096 bytes
SHA-256: f218ff554e8964865089780fb5a298bd9685a8aa70331576b3c9b8122087099f
font_01_sfnt_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 9980 bytes
SHA-256: fbf52cd6dc719c45033f03d1757e8ce93f96125695617ad381bb84b7515a94b0

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