Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6883e24222c2ac…

MALICIOUS

PDF

73.4 KB Created: 2021-06-15 17:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 61fc0b8d38cb42eeb4ab7680d816881d SHA-1: 91c83625521477c77c68857e5aff687b0615ef39 SHA-256: 3d6883e24222c2acad4f763f20de001002f79a60103a9af4379db4d32b0c2ca0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect the user to malicious content. The document body, though heavily obfuscated, indicates a lure related to a 'Vedic maths full course pdf', likely a pretext to disguise the malicious intent of downloading a second-stage payload or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=vedic+maths+full+course+pdf PDF link annotation
    • https://speakingparrot.com/upload/ckfinder/files/xovusilodine.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7bab4ed567bff07732bc5a7334ab920b/50741542581.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bedd73e7---zuxop.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9b5913dc0b1c06dbe55cd607ffd8daa6/29012802619.pdfIn PDF document text
    • http://azizolace.cz/images/file/47379105403.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/85569613718.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/21709413971.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/lowaw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca3363d0d---86590421424.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bdf81149005c00fe6e466991827660a8/lekakawik.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb0d6d7ba---6645957322.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc039dc4d---79790461379.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870824acbef---77939137463.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a72db2e1---sipozum.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/lezikitisekakepow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5360 bytes
SHA-256: 0e92f8e3f1e21173359e7dc48a44e40de5c8f2d62a394e6b1a3a5bd06fda6140
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 10568 bytes
SHA-256: 6d386fc5503a0608f8816f300b93e915356d3b95faaaee878fd940da97e3bbdd