Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef870b5f8746c563…

MALICIOUS

PDF

99.6 KB Created: 2021-09-08 06:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7f7db8a732f7fa9671969e2b35946f5 SHA-1: 8cee2e5b94facc6eec98d7b24f786665ed91dbfb SHA-256: ef870b5f8746c5631383421f8666b2c1cecb99e6c5a608f95b570fcd438ce474
176 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. 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 and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://synerhu.ru/uplcv?utm_term=upstream+elementary+a1+pdf PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608078042d965---nogexeki.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/790d04276df97f0c688c909a6f4d174e/zejima.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7bfa4e55---gevod.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/6145824559.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/xagilelejazoxumiwe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d687bc09ca6---watese.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/rukozitobefowotirejeladev.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788c38e7169---legaximokotimupowigerafi.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/jujoropotivuwidu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/4170458804.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ceaeb879e---29540296709.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4e855c42---zitidubov.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c869656b1---mosegesagenivitisobemufun.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1628642652.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/pukodevolana.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/bilenufimuvukuv.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/1037980424.pdfIn PDF document text
    • https://equinox-e.com/upload/files/15756558960.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/80788061750.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071613590681.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/darapigederepawufibodid.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///gubotibobivupa.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/40257c8c80de15310ad700152673e89c/8387401179.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/96399120548.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 10620 bytes
SHA-256: 1975ff85683a6440c367b97831aa9ddd7eb93b64f6e5ba79ee315003beadae8a
font_01_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001468d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468D 22064 bytes
SHA-256: 0c6c3aeab2162f55dabb36e3b2048a6ab874b334f7f64084fd8a29edbe06c19b

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