Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4bb59cdc0e9c8…

MALICIOUS

PDF

109.5 KB Created: 2021-06-28 13:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0259f6bbf80bf52a77f963a29dc8f1e4 SHA-1: 017274f77e915b460415359e55c40073dbbcd6cb SHA-256: 8ff4bb59cdc0e9c8d7413e0cba3d4ee729de299da2e5a88b4d41aa55d1956b13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users. Heuristics and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive URL redirection points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://pistant.ru/uplcv?utm_term=wow+classic+warrior+abilities
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/359db67f9605512dcd911f7ce002269d/51238549644.pdf
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/79759463016.pdf
    • http://brandnewgoods.net/userfiles/file/rezelifuxirola.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1m3v0rt9ehpakj0o0n7rr5keib/rudivedidid.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7b9122b3---kakenelatorafaxax.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79850188850.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3525c5a8---rarunisaroked.pdf
    • https://oddluzanie.net/userfiles/file/boriredemularagotimo.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75b6b7cee---wusuderuwupusemoletadewi.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b713c3bbe---kolipe.pdf
    • http://divorce-difficile.fr/userfiles/file/80368793720.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3168214e4b---6833080631.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a380a2bd69c---xijozexenu.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fc3c2e2cfb13cda9a304e26646149944/wepujolarojaw.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16076267d4f4ee---momujokujetujogitotosaz.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a7d0b1f0b2bed026a3dfb824ea920161/pefametoge.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/pibetadaperepalo.pdf
    • https://ozmutludokum.com/userfiles/file/balavofogubaguwin.pdf
    • https://questyme.com/userfiles/file/35641983852.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090b19fd27c1---gilexamofob.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/33e63e0c80df892d0d73f7fa4bbe7555/motitelixo.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wofarunujibiwolofesa.pdf
    • http://matraholding.hu/images/userfiles/files/bidiwinexuzukefob.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b313c10f---nepedofubivi.pdf
    • http://tai-yang.tw/taiyang/upload/file/nodinerugerazama.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/440b02448a4844bc837f32edb55feca6/35067117049.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a370d707---94621476003.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_off00014a20.bin
0bc4b01924040f018f22f0119054a6e87886112e2a452c7e49ef36bde4f5a222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A20 10340 bytes
font_01_sfnt_off000161ad.bin
6ea71490193e75637cac937bf4a44d35eeeda5ba0ad2052975f971dda520f688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161AD 17808 bytes
font_02_sfnt_off00019038.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19038 16792 bytes

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