Malicious PDF — malware analysis report

Static analysis result for SHA-256 c088f90a69dc7324…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 11:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb0efafae83b2c3d5c4701cdbc262fd3 SHA-1: e23e46373116176256b59a2e63a4899d522d8e03 SHA-256: c088f90a69dc7324cb50bbc2588b26bdb3375f08ba1c80f6d38ea77c08dd8c64
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may be used to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=ralph+tyler+curriculum+evaluation+model PDF link annotation
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1c216c8d---mozanujuvaguk.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161346ffa0dc9f---wazifekegogix.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c910206b74---18377348859.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/sufujibimi.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/paputudavufejumifem.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/vetenedodobirexupeji.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/24139955247.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/74418006564.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/16349474383.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/dejomijalorupub.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369cab98590---26279241775.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/88377310644.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/tinuboborexupuwuwamoti.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f0c0ba37f5aaee0a9657b7186ff6e65a/82682828255.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/nixijupi.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/daxeleragureve.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/eb020f5f815ef270bb1411f53fd0f9a4/70813778471.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/59574053797.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/94911293527.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/50846420840.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/sojixabobitategowoxedi.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091712140550.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/miburugojefirad.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/62009473330.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/97119427089.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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 10936 bytes
SHA-256: 80b07889426bbfffc7e644d88fa01450398135ee449600a2e616b0d6b2e35b2f
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 18032 bytes
SHA-256: 0fa58e04723fcd127364b25934c1da4398da091d8ed32f25ed975f79f9e6853c
font_02_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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