Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b952e9c2683dc1d…

MALICIOUS

PDF

81.1 KB Created: 2021-08-14 15:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a66370673594bc17fa400c25ea905c3d SHA-1: 6ed502ae108690f1ed683e62d18e041860cdfae0 SHA-256: 0b952e9c2683dc1dda8724c17fba396586f312f30b0ae2d4b189d64911f00a25
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing campaign designed to trick users into initiating a phone call, likely for a tech-support scam or a fraudulent charge resolution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/1561771886.pdf In PDF document text
    • http://eprdel.cz/userfiles/file/86296523755.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/3326543319.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///18860813840.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/22482010264.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/77161229900.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/nugudikedofewub.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/28455414815.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/lanupenedezif.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075e790a21b6---9221920583.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b8296d59---batewotawamixadunavajoxi.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lovosim.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/10400741348.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/9577511250.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b98364b0472---kunidoderiturelukisegofas.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20284d90b---19361196253.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6e181b418b6827b61d48e589da20f51a/desejozaxubiruzapus.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/fipexadoxerixuf.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/88211475108.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/muzolepivubanipo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b5fd798e47fdb619bc79cc9123c0852c/sakasekivejaxi.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/43504422746.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062609174573499.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a873cd88a62---tokiwuzuwe.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/f064lnjpl1nssq2mqdti6uemq5/budegorezojewufa.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/lasejamebat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=elena+ferrante+my+brilliant+friend+pdf+freePDF 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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 10608 bytes
SHA-256: d90e31b44edebc536628a59e959f84e2b2f73ecfaef9254a2b3bb4ddd230f64b
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16540 bytes
SHA-256: 665c48d80ca4ef97d0c838269c0c1da6b836739d29f565408c234009b63caf5c
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1