Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fd54c87765e6b7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 09:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2a2fe1d3bf82aac929bd1b4eded0a09 SHA-1: 228c8b69cac292ed5e8b2ec3eb121caf68ce6472 SHA-256: c4fd54c87765e6b77c57dc896bd88ea337789fdc1dbaaced757d989ce2c5dd22
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm and a callback phishing lure, prompting users to call a number for fraudulent purposes. Embedded JavaScript is also present, likely used to facilitate the malicious payload delivery or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://novosib-sport.ru/ckfinder/userfiles/files/6249967933.pdf In PDF document text
    • http://boilerservis.ru/uploads/files/zerofuxaminuzolimijap.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210613031721539.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2918808009.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/56595023050.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608739c6be9e0---65514067158.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16216484114919.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/joxorejobenovunasal.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/rorizekefanatul.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/93884855871.pdfIn PDF document text
    • https://izometal.net/mm/file/duvosasigulu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47f41be86---luvonuwiserukadatuvuzis.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/57955639763.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d0ab16957909e17d9c0cd77b41b50b9/vuwixobukepibara.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c02391c25---12358208791.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/tomadaj.pdfIn PDF document text
    • http://skolky.info/foto/images/file/moditezuluber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=typhoid+vaccine+cost+in+indiaPDF 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_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 17680 bytes
SHA-256: 4e3a3bbc21f974c910ef327893c71c7231af30521d267a678096f094067f21e1
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 10608 bytes
SHA-256: 1ccedf82d7d777c6bcda47a840bca33864e0f7817fcbd3c0d86ff92f8cb1dd32

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