Malicious PDF — malware analysis report

Static analysis result for SHA-256 5326c732947cd714…

MALICIOUS

PDF

71.3 KB Created: 2021-05-31 12:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 406c05d7f3d90806c5f65bf32da1f702 SHA-1: 09ccb429e2c046d74fd3d5d91d9b3566c7b8a6d7 SHA-256: 5326c732947cd714a05e2e8459462135572c22f01a3477fb1e494d91f877fd8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or SEO poisoning tactic. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent rather than legitimate content.

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 http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad19b58b2c---lugafisowe.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9863b4303c87fc05e05a4412b5c46228/waxonijakej.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/76149505017.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd5a2d75b---69340014567.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/nikowufutuso.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/lejovanawesikugopip.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/m3c1pktn95astg2d4rfqemm8q7/podufajujebunelum.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fa75bd191a3fdc606e05902fdc697ac9/zaxebegibifezowukafed.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zuludiwuluf.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b27a743a---zumenizejeronuno.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06b9681eb---47281849210.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/pn0011ur4ao16iodppckt4tkbl/nozedufatafeli.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ca59374f15ec90828e86c34e8c48451f/ladadosuvujupefujodoleper.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/wexowojovetet.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/~3/6naE_Nh8_CY/uplcv?utm_term=borax+homeopathic+medicine+materia+medicaPDF 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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 5220 bytes
SHA-256: 9c34c82c67d1a3d1585011ddf2b62dde5c7b5db62ecb0e192c6cf5048596b670
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 9920 bytes
SHA-256: 53370e0a910e3c0acf2b8dbe96744154861d182636b3f78dba4b39edce770f4b

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