Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc8dc6bddefe87…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 20:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 806f8118afeac282de04b4e09c852754 SHA-1: ae41c55685c5016a7dfed63870b79211e708034f SHA-256: 81fc8dc6bddefe87497b3ecff212986acd0b7a1fa679c85f67fd9d3ab712b366
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits characteristics of a phishing lure, specifically a password-protected archive scam. It contains numerous links to potentially compromised WordPress sites, suggesting an attempt to host malicious content. The presence of a callback lure heuristic further supports the phishing pretext, aiming to trick users into believing there is an urgent issue requiring a phone call or download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=fingerprint+security+lock+for+android PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134e9059bc8a---21644212824.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/04f05d58017e9763231bcfd557d9f563/dejezozetawekabevinijopo.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vobewaxosiriralenez.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/59925567218.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jiriv.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fasabezazagozovulebarolir.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090312515731.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tulafisiz.pdfIn PDF document text
    • https://successalpha.team/upload/files/84706252596.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/83564084203.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gegefikufixarutomabas.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/pabarajubabuk.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/45179375284.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/1735743248.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613528a13be19---mazuguxuwi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cebd135fe---8293674118.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/151924548.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kakupibaboselo.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/70008944885.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901074407228708.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/wofelunekogukew.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fs0m7t6eagl809atmg2pntfq84/62412044280.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t3a109quofr1afk9p604aq3gk7/36477968176.pdfIn 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://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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 17768 bytes
SHA-256: e4e0f9cc9d4d0a741ed5fd76fe15c04c59a561ad44038c69b75c53f81fad0af8
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 11080 bytes
SHA-256: 06df458d4c584a505ed79c42dff006bc99f215f04aec889549265ad2a9973513

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