Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8213b460edc9a28…

MALICIOUS

PDF

98.9 KB Created: 2021-07-03 09:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12221d2424f28adba8e01fc1dd7a137d SHA-1: 504495a6c7ea1ab9fecefabdad3b467b7aeaaaf6 SHA-256: b8213b460edc9a286c434c159ca16065519e4be22c1baba5b37794b224302bb6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://ahcxdq.com/uploads/file/011121101348.pdf
    • http://chingyi.tw/userfiles/files/dajigudepufotij.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/213cb57ded25ae5c6f37061b136199eb/pekebagupiburewaz.pdf
    • https://khanikango.in/file/55172158582.pdf
    • https://tonitomov.com/picture/file/wakije.pdf
    • https://adasms.fr/userfiles/file/wavuzepus.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e99a8022d---binogezo.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/fa0cb85654de814fd00bf4aed13b8a4b/feropovogovemakexobanafak.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/726c4466124403f69d48fc5e34a607b3/52337267873.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ade181273---23526201109.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6a075967---91171877673.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0a123e4e---fidanilix.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/11358145ac7a86e39d7337da496eace6/danavogupe.pdf
    • https://akita-inu.lv/www/files/files/jofirobugazaxe.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05a303cb6---tokepesusojaradokeleguv.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/deatdgqd4amp069m1joh0nanvg/vazoputonomusubola.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c4ade8c3---wuborugagafotezizere.pdf
    • http://gld-lining.com/user_img/files/18047173893.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/60512181454.pdf
    • https://egokituz.eus/files/galeria/files/32427695105.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de103527513---wovefisatixum.pdf
    • http://ngocvietbungalow.com/upload/files/febupaxubeganibowabiwew.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b843b32c1---bubekufalexevopitubodag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=deming+principles+for+pdca+cycle+include
    • 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_off00011fb9.bin
3fcf2feaa9d22c983bdae8220f409807810664990953a3cf483fd43ff50aebca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 17356 bytes
font_01_sfnt_off00014c96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C96 16792 bytes
font_02_sfnt_off000164ad.bin
a7d2c52663d4bb28d7213430734d4b8c1bcf3508f0aaaade638a76259232c089
pdf-font-stream PDF embedded font (sfnt) at offset 0x164AD 11080 bytes