Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21651b52bd17922…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23ab07c76fbddb505bfe917f1189bfd2 SHA-1: a6de3b16a57bfa44c0ce9692f758059bb5879f08 SHA-256: e21651b52bd17922233cc2e2bf38a76b02e3e865e25d7d2abae07ac363f9791b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://irlanc.ru/uplcv?utm_term=leo+man+in+love+with+virgo+woman
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a567aa99c9feec00bc11eb2f9e9b9b85/41414919534.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/185b00012f6bd6012ec1f6c985570073/xelomewiz.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a51de0723718f79dc352242743bdda07/diduvisupumataz.pdf
    • http://adaviestransportltd.com/userfiles/file/texapezo.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc65f4dc3c---lefemo.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c46059f0f---74253611331.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ee04b37d---nefijazos.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/98d9c81787f43507c48ce2ce560c08ce/54463195604.pdf
    • http://aitrans.cn/UploadFile/file/F1202105290529513818.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qhsj0trejrgm7014vi97ub25b1/18771830306.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8e8242830aedf13b0150bdb64788cb7c/levemalajobonufuburag.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5dd89e3f3---telenadenopumomanaduwe.pdf
    • https://semineebrasov.ro/printuri-fi/files/57611695370.pdf
    • http://sity-luxe.ru/userfiles/file/52633349873.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/83oa727rfqurld9p7c22nkh9ua/85826301940.pdf
    • http://garderoba.sk/images/_file/wifumajomadusogimete.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc224df4e---21275056567.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f21bdc20---72337037509.pdf
    • http://staresecurity.com/userfiles/file/58889626267.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d9b4b40f3c5a0f8d8c32fdbd398903fc/zitupuzazewot.pdf
    • http://cokhixnktientien.com/Images_upload/files/65784264073.pdf
    • https://tort-art.ru/userfiles/file/runanunu.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2400f03ba---85242244893.pdf
    • https://dianthusindustrial.com/resimler/files/luvije.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/bnebjivmffml855n17fl7rjoic/64938165728.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3049de5cb7---vurotupuwazidiguv.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_off0000ea2c.bin
e552c1fd0f0d956e87c7f93f528381685bc1f4cb10d1165c9ab9c5228c24a197
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 15892 bytes
font_01_sfnt_off000112e9.bin
0e8aa51216776a77d3e55d68134ce786f8c303c6473a676275703ef86ada378d
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 10496 bytes
font_02_sfnt_off00012a91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 16792 bytes