Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23c5ab81f7c69a3…

MALICIOUS

PDF

64.2 KB Created: 2021-06-23 07:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a17ff19de76ec7f740b89abe3558977c SHA-1: 00ffa740aba1b6f4b009d98939f348c96418c517 SHA-256: a23c5ab81f7c69a3acd862a7b24f90f2fdd1d081275525035c95f084f7ac7650
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which appear to be part of a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Cbse class 11 physics laws of motion notes', which is a common tactic to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://catamma.ru/uplcv?utm_term=cbse+class+11+physics+laws+of+motion+notes PDF link annotation
    • http://acpiindia.com/userfiles/file/pufew.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4b0b97ad7e7ebb019fc84b2fb9a9a482/93318598342.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/68079452152.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/66018748272.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/dojojudaxijitemovawuxokuz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad0d75a1e---pilogekodusapotaw.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/zafiladuvixumufif.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/23105827762.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c8t8lp7ggo7vc8j93l7u31l11l/83445173325.pdfIn PDF document text
    • https://beaszemin.com/files/modad.pdfIn PDF document text
    • https://activepymes.com/pub/file/xeruraga.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbb328954---40540365478.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/fezeluj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/h2s37dca25qr8r9giuhr67obs7/pizojinu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb155d1e38---97328772094.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/54335389860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 5448 bytes
SHA-256: 43e88a47661b3431e6a9f9c86725cc148e6c032001107d4ad9f01f94bab30728

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