Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4f6a934865cdd6…

MALICIOUS

PDF

73.2 KB Created: 2021-06-25 13:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a54ff161ac686c4e3568b1eb67942c5 SHA-1: e9b70712abb8865b34fca8b3771da55b773d4be5 SHA-256: ab4f6a934865cdd6b3fd41054098c93d207201584c4a20df492daf52b646179e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs and link farms hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded URLs point to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/uplcv?utm_term=multiplication+word+problems+grade+3+pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a541279f894---87634739753.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eae205b9c8762ae94e583c36b55d80b0/98838850274.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a7a6dde86---82349372921.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/64151671168.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517221937530031.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/28044700705.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3fe20ae83e304e07a512815a463c51b/masipamoriza.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22adab343c---24617714374.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5e93cd8ce00c879c8aeb1967ac48e512/80184047349.pdf
    • https://educhina.mn/editor/files/vipofivekobi.pdf
    • http://hitecds.com/userfiles/file/18627039518.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b127ff6b107685ed6fcaf4d3ccc85f75/1913399671.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/werow.pdf
    • http://rymwid-training.com/userfiles/file/22494009398.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1901d5c0d---36349140346.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB818 16792 bytes
font_01_sfnt_off0000d02a.bin
9090af05b02ebf9928ef56437fd1457d2673fe0438a5e9ce025a4e6a7421530f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 16628 bytes
font_02_sfnt_off0000fba2.bin
b12f8a49ed19f0eb85f0b812e2af0d5e31445d4d970e7f3ad31e28f760482ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 11456 bytes

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