Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaaa25497b629eb…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 11:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 872696db9e8cefc9a4e8b07f0f71a591 SHA-1: e8709b46e3f3a18649267bbc1949292d2fe68678 SHA-256: cfaaa25497b629ebdbe7f2088f410c5d4fbd271711181cf828911eb1de7ede77
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://serka.com/serka/upload/files/lanopilavata.pdf
    • https://haysalon.com/public_html/userfiles/file/59205643379.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/23dbd52b8953fce969650c1c9607214b/41248738350.pdf
    • https://infoenergie-loire.org/userfiles/file/geledudadulasufalupas.pdf
    • http://inglewoodreunion.com/clients/68690/File/63740093320.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607014e67f267---rekenunudanepa.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd43dbc003---14472589923.pdf
    • http://fitviewer.de/files/file/jibirejoketupazej.pdf
    • http://yuanyoujie.vip/userfiles/file/segotabamanaxipax.pdf
    • http://aaaexpressac.com/userfiles/file/98608817932.pdf
    • https://fedico.ca/upload/editor/file/47072530661.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/001a89ce294acfa4ac59780318b6abf8/21455757131.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9c90f6131c601d08222ac52ef99c9f93/remavopekipapaxiburupojur.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9ee3dc62---wuxonafituvo.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e066e855f9---tinukiv.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/12d81ee29aa703a3c668252f37b90845/15305404625.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/928290a0133b823b2909dd0037eef0fd/25839347230.pdf
    • https://louvre.lv/res/wysiwyg/file/10644014289.pdf
    • https://aawyx.com/sites/default/imageuser/file/fuwijuverel.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1708a0133316dc01ac5fa0df555e4c99/61990027194.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cepohm6qo5f39bc1uoe75jtp80/zinivugubuzixemotozas.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/15736257893.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160966a21940ee---pifazijali.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/kawosibolasivobe.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58cf9e194---witebinupezanoverixas.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/53926092089.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=getting+near+to+baby
    • 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_off0000f8a2.bin
d5b6c5379fa692968549eafb23692d896454744d0d5860c4f89fb0e3c0f95625
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 10360 bytes
font_01_sfnt_off0001103e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
font_02_sfnt_off00012850.bin
a424635951dcc498f739e9cd99d8358a1fd9a18b2b97caa36dca58d15f20eae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 16780 bytes