Malicious PDF — malware analysis report

Static analysis result for SHA-256 546dcb163e101162…

MALICIOUS

PDF

64.1 KB Created: 2021-06-09 00:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6e89398c6c6d97993723495e4290fdc2 SHA-1: b12ebb93fc99e0b39f8445e3b906499f27b598b3 SHA-256: 546dcb163e101162b51d1e69a353efe6988063c473ee989b589ff9b68ab26e8d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it is used to redirect users to phishing or malware hosting sites. The document body, though heavily obfuscated, contains metadata related to PDF creation and a URL that aligns with the overall malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=physical+pharmacy+laboratory+manual+free+download PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173c5dbdb5---mudutiximazatulu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0b4d1ef372a3126f0e2b78b063731180/63603250221.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/567c920cbb8a5f247b2ffc9dc1f218b3/59855717786.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e6bdae539---553229999.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7def7398d291568978339936dfd1f8c7/437664920.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/53257843737.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609807c2ef416---42433837940.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1ea39b20a03a07288aa4e205d3919e5/katimofokalazuk.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/92107822688.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/26211642463.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1dba61fd816581fa09e9b39314acc0d2/baketet.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mrh4c97t9n4d9rttkulk3pklp5/nebevubejewegaka.pdfIn PDF document text
    • http://abc-tel.ru/data/File/54027533676.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c56e0e4cd---24656862185.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_off0000be42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE42 5728 bytes
SHA-256: b9b5ae1262690b0bbfb1e00a9eaa012858e251247aca14c73a7de5a35a0c52b2
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10024 bytes
SHA-256: 8ac1f2fa7fbfac7f036f80b7706c25fabd0cea38671a2cabe89356af69e95f4e

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