Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d71bb46bb8b44c2…

MALICIOUS

PDF

167.2 KB Created: 2021-07-24 21:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd51ff9b6aaf3fae53d47a515cfc4c81 SHA-1: 3fcc571110bb48272798cbc1fdec60ebb74a185e SHA-256: 8d71bb46bb8b44c262779c8674e6f074ceabe982bc2b5cc01db811497e0b0d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and 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. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pezenasenchantee.fr/userfiles/file/fifomutulusuzazavagizija.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d391d4c---24569319962.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558f2a3339---gowijezubolifikum.pdf
    • https://bnbcostaverde.it/userfiles/file/88458494490.pdf
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/81703671434.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16753860d---palogosoduxoxuva.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9ee6ca54f703658ebb3dd845bb6e4584/setiriwolowozexatasitomed.pdf
    • http://31kouqiang.com/userfiles/file/1624039881.pdf
    • http://kaitosushisb.com/uploads/files/rimuwinasamovurorulejuwe.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c930c2d72---27454071794.pdf
    • https://minlinart.com/archive/upload/files/dizovokejimene.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/898e40c4696fefd59c57fb0ef48359b5/gefapogesidedinugak.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160949c010a6bd---61279247644.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607226b39251b---73370583591.pdf
    • http://ackerviewguesthouse.com/userfiles/file/ferogi.pdf
    • http://www.findvoters.com/userfiles/file/vigar.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/h9hhvurd65p0ntj3n2gcsat0tk/pedosoro.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d030801fb8f---vosotaxasebaterubagokodez.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/bisupedanavojisuzabeb.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/fb274da607181c445b47e0fe903b1e70/67433945178.pdf
    • https://adsbudget.net/userfiles/file/23803662099.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/19be3739a9f929e29feddcb70f454857/labovozilutazodaxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=baixar+livro+log%C3%ADstica+empresarial+ballou+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_off0002289a.bin
2588886004bdc8add3728f1c26bd2575130bcc81a22996906de3d721abe8a3f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2289A 11384 bytes
font_01_sfnt_off00024310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x24310 16792 bytes
font_02_sfnt_off00025b22.bin
b37a6a0812353c374f5c12fcbebde4fe637cf78657f8f03741f374072229cbf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x25B22 19940 bytes