Malicious PDF — malware analysis report

Static analysis result for SHA-256 b438bfc166debc69…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 03:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69c9a09290dc5dcf0595603ca1c23b0f SHA-1: 3d6dbb2101509ce9b91b076a4a89df7729e90dbd SHA-256: b438bfc166debc6947959de6aff66356c91eb0513f9fcb7ef3aa98fd4e28c87d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=famous+greek+astronomers
    • http://luxe-pools.fr/i/File/fuxinediwid.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/07acb10ab1i5f0mfudo57ch112/15764203945.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b27a205ee373d956923f59d80192488d/sigibonarelod.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaf9e1b0f59369a8cff620e96953a0bd/tixakuj.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/73912458280.pdf
    • https://serviceservice.eu/userfiles/file/xiloke.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fdd799c---60309123573.pdf
    • http://niezapominajkowo.eu/userfiles/file/94009592052.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0b212de395d16a24aac5a61096c49670/bizadagejametufilok.pdf
    • http://webursitet.org/Files/file/nibexemitorebuxoku.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504083235659753.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rppcf133j59gv228t42ed2nc5a/rozaziv.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/46455439048.pdf
    • https://accuratesearch.com/userfiles/file/71566690656.pdf
    • https://healthmatters.me/userfiles/file/xinasaxamisusezixavamo.pdf
    • http://a-kamen.com/userfiles/file/vobap.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d449263d782c2ed50e24288de26e5ad5/gomifowaposenurumizonad.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/lejosed.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc42894a4a---ziduxosaruful.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1be21e4eb---rajolukusezewirejizot.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/7249f1c120f9c622895c8b884e7d7549/24825356639.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/20077061593.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8d43261568606c63399798d2d3a0e348/rogetibogilo.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_off000101ca.bin
e33e1569f8db9115a21c2ad78516d9b53198d61111d9193918e072348861bad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16952 bytes
font_01_sfnt_off00012e0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0B 16792 bytes
font_02_sfnt_off00014622.bin
2ec6ce453a2151b41291ee02b9a262d7052b96b0fc05561730f761620454ff25
pdf-font-stream PDF embedded font (sfnt) at offset 0x14622 10484 bytes