Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d4b4923cf2b072…

MALICIOUS

PDF

100.6 KB Created: 2021-06-26 19:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c57b055171c812fa3de3489ace27feb6 SHA-1: 650d47ded5c60d56508b968ee264b6730537bee9 SHA-256: 85d4b4923cf2b072c04bbf60f2014419a2b0269b46281ada489d9971bb7fd90e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://lumieretvie.com/userfiles/file/85656585315.pdf
    • https://preprodpcb.com/userfiles/files/gubizufivilafefutoremedi.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16074216183d06---9027256516.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6ef2517d731b670dd0f04ca0060cb83e/35600897355.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160828f2f00b42---kugojibisedaponusi.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/46b875ca50310401ba22583c2d9ba806/33523178263.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/dglpjgit0n1g66u7o2h56k8t7n/70669209452.pdf
    • http://khanaphatgroup.com/UserFiles/file/90508167183.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3700cae8b1af64d8bd6d8bf77cdea33c/dewok.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cadd9b8528---47346809612.pdf
    • http://decaiyun.com/upload/file/210620060531429490kt7dozgz4iv8.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rd6sl6vndje0u4n4rif03rhalm/94217849782.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be461e990---zujedivilobovunuwesekerav.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8749fc693b---60353111816.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/75gmpdkje75fe4l8g9u72taing/86832783795.pdf
    • https://wegofa.com/userfiles/file/57594310798.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98e4cd2f4---petupo.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cc1a5f3b---12124776314.pdf
    • https://anmimar.com/royal/userfiles/file/27550437836.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfc7d405e---sajogukexulokabebodow.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad80ec2d2---tinaxepumedamomox.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/17d72f850a34face685d4232d889ea29/61612246499.pdf
    • http://childhood-matters.com/clients/49507/File/xesabino.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f9d39a7---83639116560.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+numeric+to+varchar
    • 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_off00012536.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 16792 bytes
font_01_sfnt_off00013d48.bin
f74792773a5ffa2f6754d5010861a9f636c8d59e0a01f25472790ffb9c498cf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 18176 bytes
font_02_sfnt_off00016d96.bin
37331ae63f891f8facd591503183a08e77528de757679cf556c1be224d8d7502
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D96 10476 bytes