Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a743d4d15eec07…

MALICIOUS

PDF

69.8 KB Created: 2021-09-20 17:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f0a3dd0c8c79730eab76593b4abcd76 SHA-1: bfdbaa8a7355d58e8297f32af3df11c49e3021c6 SHA-256: 82a743d4d15eec07e7d26d316693b376cb8311f0c689a6255fc9d80db221baf8
176 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing. No scripts were extracted, but the overall structure and heuristics point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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.
  • 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://huntic.ru/uplcv?utm_term=mafia+city+game+download PDF link annotation
    • http://www.drivingschool-brno.cz/files/files/82519105236.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tosaxajudesuxe.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383825ec6ff---88545545635.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/66706088902.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/34026319820.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573de2d377---5560247058.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/logisukoxejo.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/58207706419.pdfIn PDF document text
    • https://mimpishio.com/contents/files/36219026102.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/zexixo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144453ab8622---6754262660.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/telozog.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/80356927652.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kosogagi.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/buruledikimexali.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/jesunetakiziwadirinev.pdfIn PDF document text
    • https://superpart.com/files/50908715579.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/59319609776.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/potibetatapovosali.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613031f431935---kuwidebazezutenerifil.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109040543438675.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/80376723544.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pufax.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/30780076412.pdfIn PDF document text
    • http://erimti.com/userfiles/file/73490504386.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/bigopumuvuvorifujowoka.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_off0000b4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 14496 bytes
SHA-256: 8bc72ccf6830e12d1371199b5596cf1bb1ef637aa76845a434fa039a8d82f8cf
font_01_sfnt_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 10744 bytes
SHA-256: f35f0c692c4867d7787b8f3aa7e13c9f5aa13ed53733f6f7a69ddd6438cb0c27
font_02_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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