Malicious PDF — malware analysis report

Static analysis result for SHA-256 76819a2e6340bb43…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 19:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37f1dd98321ce98151bd424f25848bb5 SHA-1: 9a3a643e8e5ad251d356fee49b59638d4999f0cf SHA-256: 76819a2e6340bb4308a201e5797d590e6272a22254282b7aa7bad867882093ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=ps3+blu+ray+remote+2.0+manual
    • http://e-kva.ru/admin/ckfinder/userfiles/files/wikexopiwebimavopugisagim.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/q6fk6od6al9a8rb9o20us5n40p/katomopimobufeguf.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/57dfeeff017a356f67c4b03ec37b0cd3/93478854257.pdf
    • http://qkmedica.com/uploads/userfiles/file/bovagosidotarixiwetakur.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0m1uafme67rbn8bkugop79s6td/zipunejutoxej.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/aa0fd56590a8114025fbf8582457fa7f/sizatube.pdf
    • http://ecohost.ru/pics/images/file/3050830119.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/r0jpstvuqvl21uip131rl2s26b/64864751821.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c0c687271---gaxate.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/58p9u52520kjt1dg09mh2jg3kv/11412151451.pdf
    • http://siembra.me/uploads/files/6709406295.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab82e68aa---18552850968.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f0148f3d9243ddbddb38d698ecd6dddf/9554052901.pdf
    • https://gites-les-bardots.com/userfiles/file/65167564613.pdf
    • https://mmszke.hu/files/file/22059168764.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087227d494dc---vojakip.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ab4f837c76d3ac2cc8327895c517e008/99597599809.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/907e8c9afad5a32d448da14c9943870a/jovitodunibeloje.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d86e54c188e195cda8ac3c9145a168a1/25998953529.pdf
    • http://maskaevlawyer.ru/userfiles/file/xirukuvasafe.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e85a0d537f1598dddadc63d7506332f3/sizijumomunupexopefu.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g5ut3g9mpp4kel5hopjr3b7272/gerori.pdf
    • https://cissud.eu/uploads/ck_editor/files/xomewokofotimase.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9cfe24b2---28075222820.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c277f8a7312f0e22d3458495a480cf96/sevologujaduko.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_off0000ed19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 16792 bytes
font_01_sfnt_off00010530.bin
9937bb05e5374cbbb2d05e7b9dd26b27c239836ada35562040ce3b5bde1e8934
pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 11012 bytes
font_02_sfnt_off00011ef1.bin
e5677338b0263df07aa546c301ae4609d3c5d025065936600d6e3043dbb7bed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16824 bytes