Malicious PDF — malware analysis report

Static analysis result for SHA-256 662a94de17e4479c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 08:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd6f0daedb55182558e898e759d839f6 SHA-1: fc5a08522aeef44cedff0dbfdbc4a8e10157e892 SHA-256: 662a94de17e4479c626de5aade4e6b9f04c38be16ef8209fcf81ead3f195c652
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, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=download+hd+tv+live+apk
    • https://denizlihorozu.com/resimler/files/sesuluge.pdf
    • http://telek-trans.hu/editor_up/71446492803.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/25e1bdd40007f21fc43be54a9944f879/kogerugozasurubizole.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1998575a---xirotine.pdf
    • http://locum-system.pl/userfiles/file/61092476105.pdf
    • http://wajl.net/img/file/20219802358.pdf
    • http://slsnn.ru/content/files/vogetanemevesolimozipaj.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142d761373ea---72959727415.pdf
    • http://mtkshop.com/images/uploads/file/10629244039.pdf
    • https://stpm-sa.com/userfiles/file/zikafokowetalalabunori.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/n3mchboeu8f70rg3urjfgdltb7/16952768361.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8aa2d786e8721c86435e740808abd8d6/zafabudo.pdf
    • http://aadcnfgl.netsociality.com/upload/files/kivav.pdf
    • http://officeharbor.com/pdtInfo/tamaxododafanuwom.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/sotod.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137539b7a4cb---3353718564.pdf
    • http://hoangduy.vn/vn/files/67925796583.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/15496377831.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/8969204989.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd25d03618---29815320002.pdf
    • http://archetipoingegneria.it/userfiles/files/foridowafaxukafiper.pdf
    • http://shannonlakeestates.org/fck_images/file/14390686712.pdf
    • http://mywayrtk.org/userfiles/file/87689558335.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1fdf939c7a749fe15a5a88eb8e7ed3c9/wapafaworowaxesejunirar.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_off0000c6f3.bin
e67413a6f2e2dad484f02e0f6a0200e886d72a876571af147840125966ef0a6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 10468 bytes
font_01_sfnt_off0000de9d.bin
9fc1cc418fe80873ef3a7043d7249bf1e2b8e029a0a685fe8fcd740038ca2fe4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 17640 bytes
font_02_sfnt_off00010c01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes