Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f6fce7c2624159…

MALICIOUS

PDF

87.5 KB Created: 2021-07-29 21:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 545002d76b83772058ab13c98021cb01 SHA-1: f9df0db5c82ddb12727e7cdb28eeadc19cb5625d SHA-256: d3f6fce7c262415988e54b2ba5b6350f16a62b4dc1fa3a860e51db3549d4c9e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links to potentially compromised WordPress sites and a link farm structure suggests an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number to trick users into calling, consistent with callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mimpishio2.net/contents//files/66021883189.pdf In PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/ae5952c09057dcb877de0592bc49860b/lutedabujinosu.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gezodagisul.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/56gmdfgss4batjodnob5csld9l/zamepifapotire.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/suvilukevimaxos.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda00820c27---27967594465.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f1f399c4---21685474787.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/gegubukupibopevutitajox.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/vetalok.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/da91b0792f6be6c196feac88f5fd5db0/12762688481.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/97280248365.pdfIn PDF document text
    • https://medius.sk/userfiles/file/22897115919.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9181fea8a2---34783448470.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/77091959798.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d5dd71df4d7e4e5bfabc132d7150e020/91228094393.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/fibofetegatora.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/kefijupop.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/a7bnqup82cgjrdptjkp5va717t/laladuwadarivebari.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/71029322359.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/oac1j654ri1l1insmo26576r7q/83227558708.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/fq3p7sq19lbsajnuk89vbmfs73/jijuduworibopulivuvuri.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/44v8oprf85oiskqvj7m65dsire/guzosamoxuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=comma+practice+worksheet+answersPDF 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_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 16964 bytes
SHA-256: fc675a2c1162bf2058d30e1bfdb1ca770294a1e7c7c87c7367f9169fc31c7f7d
font_02_sfnt_off000134dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DD 10800 bytes
SHA-256: cf32a10d55a60bb8b02acf774f5b59f1e9b9595c2e15a396d83277704caed8ed

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