Malicious PDF — malware analysis report

Static analysis result for SHA-256 8384ab3533e189e3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 08:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 353bd93fec244f3f8847ccf61cd56a6b SHA-1: cb6618033ed3b36cc2e7e40b50c97b56def8c98a SHA-256: 8384ab3533e189e37e7be1daa3da74a9587590431c348011a549c6eae93f7a05
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the 'SE_QR_LURE' heuristic suggest the document's primary purpose is to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dogomanhnghia.com/uploads/files/87660134796.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84eceda33---nifixorug.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/megezerekunalox.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96c5bb393---tazev.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/pugapupu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/23971274503.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/samokalefem.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/82321738044.pdfIn PDF document text
    • https://makenie.com/upload/files/vopimomupeto.pdfIn PDF document text
    • http://bresky.cz/res/file/4848124219.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/risukojujemesozodunuxes.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/regituvavedamol.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/sapalegogikofisuzetuximo.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gekomagaxupoxegovawerage.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/be98725ce078bb8133b2d3a51766482c/4813327024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=my+body+is+sore+after+workoutPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10720 bytes
SHA-256: 06c6dbcf20a3ba2dc934489caa8dc5b647a603ea7cb9ca6468d2321751d4b003
font_01_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 18412 bytes
SHA-256: 5d8d5c8d3771bc0611ef5f49360917d6fda5d704589eea9fda91cc3314a927f8

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