Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b876689e0041f7…

MALICIOUS

PDF

113.7 KB Created: 2021-07-07 05:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d46e68682596f5b9a83c5a5648f9953b SHA-1: 82adc8998f6922f3abc26fcd0aaf2ab7a14a6dd6 SHA-256: d6b876689e0041f73d237d494916e098f1e02fb8056542a06ee5fe541fe48889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=west+side+facing+house+plan
    • http://cariboohose.com/userfiles/file/17405941236.pdf
    • http://yljx.cn/images/upload/File/kugiz.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9d17c251e---40640990449.pdf
    • https://aglogistics-bo.net/userfiles/file/lazevabetaved.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/onhup6imstbs962gujer471qm3/14270633390.pdf
    • http://moon-villa123.com/CKEdit/upload/files/nuvolizuvimusobofarune.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f88989e879---59317500296.pdf
    • http://agroanaliz.by/upload/editor/files/zuxaburud.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ea403cae5b956b650aea548564028409/vitoditujenataronok.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c8b6dffe37ccabfb7ba8eff0cde385c1/dijavibuvesulezalagonoz.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50a033605---25257713787.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9dbd0f56---lisiv.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607617ceb8c74---77538143486.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834238b33e5---getowuzezumavaled.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608325a6261c6---jutidixafuxulapa.pdf
    • https://sunarchegypt.com/userfiles/file/xuzilovegipowakefuvukenu.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc83f21a8c---22473284827.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63309baa3---96042420631.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/pr1klubbd15jcd8l95nfrjpeo5/77134625178.pdf
    • http://angarakshaksecurity.com/userfiles/file/6259966508.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4207928a31366476724b6c9e2bcc24f1/pobabimetotojaxulixegin.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d77a46de4ea4a0d91b7858a0e7adcead/70224236857.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738892b2926---19186632169.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_off000157c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157C6 16792 bytes
font_01_sfnt_off00016fd8.bin
73b1ac807f187bfb0fc92a2f8a4b26b678abc41d47b106bb16c200996ebf911c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD8 18200 bytes
font_02_sfnt_off00019eef.bin
8be243a33a33abf6b584e92c308492463a4736f604d75ad429a1996d090e815d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19EEF 10892 bytes

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