Malicious PDF — malware analysis report

Static analysis result for SHA-256 831ab4eb1b63a746…

MALICIOUS

PDF

74.0 KB Created: 2021-06-25 03:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 762cad0f17c7d80d540ccfc64bd4bd4a SHA-1: de51f0398e9cf665c472e5fc397b08355154fa4b SHA-256: 831ab4eb1b63a74622f91d3fd8d68382ce52c278c8810dddd82577bd068c62ba
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9327

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=cre+levenspiel+pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/319434f2863e00125700e6c2c067a59c/nawuvuxojirum.pdf
    • http://annandale1963.com/clients/69704/File/48565512057.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089520e8e3---72022557739.pdf
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/8ef784b2b75f63d53dd1e553cbb9b0d2/87238855491.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b9c31aad0499c112a8aa679c823922fd/25528807042.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p6b0ujhmj2qmdo0cq4vvqg4ku5/93490240610.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d9bf8140a33b4fb41fc513642be83490/bakutatubugudotexil.pdf
    • https://luyenthitoeic.info/userfiles/file/xudigapatekewudizewiruka.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b3a6de30---soxetu.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/543a0058d2dbbf110f6b0949fe5ba527/56465392982.pdf
    • http://easyreturn.store/userfiles/file/xiwagovuwobimo.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/17gl7k65uppab61bb2qs378oa2/gapebupevufaxidefo.pdf
    • https://hizlipin.com/calisma2/files/uploads/tipodajogisaloxurodakewiv.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16237800280566.pdf
    • https://tavio.ru/files/file/rutupekajelowolubuj.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716cdc8adfb---37179217993.pdf
    • http://gleneaglehoa.org/images/file/nosesomavebevivi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea04.bin
df0f8316631144ac0eb74b93eb92a7abf84d6593a31cbce0f3e3254914ac1591		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 4504 bytes
font_01_sfnt_off0000f952.bin
81c1b7311cf947448f1f20d9970a19738d667b992623f2b93347a1bb5a7037c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 11660 bytes

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