Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35c21ab96d41f97…

MALICIOUS

PDF

92.1 KB Created: 2021-07-29 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a2899300b58457e34d278bf3dc9cbe11 SHA-1: cb37ab5a0151c3025a2ed0c4ba743dc931a88fb8 SHA-256: b35c21ab96d41f9700f7b0b3158e752f8b23e782db97927d895e1cea3e306cdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://csc-028.com/userfiles/file/20210716194253_5l61xw.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160765845bb276---5747235237.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e85b0517f7e9b58a57e2dd493ea681a8/47272633620.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/jokakudowizuwatuvotovet.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/57310461132.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/47984888287.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/37812497987.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29fec2dd9e---12750353899.pdfIn PDF document text
    • http://innotack.com/userfiles/files/wimowewam.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a3a14e02---15012712028.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/54e651b3b2765f1fad457b2dff40d365/42736301358.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/72351344444.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/zabigetopiruwomufi.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f0a4ee1f---fujewazunukewajotutevimup.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/20885d568282e3ad5c852fb3365c18d6/jizorazanobo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4090e82f74---galedevotanipof.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/fonufemuxobotumafimowed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=natural+scenery+pencil+drawing+step+by+stepPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c1b3a0620f5e330c0207919a5aea0f04/kexudukuxew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 2968 bytes
SHA-256: 10f95cda1311f6fa9fc8d814b4607565860e51b157b07207b6dbb010551191be
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10984 bytes
SHA-256: 05904b887fcbbf82c3770722e1328e449fc270cfe95bd8a3dfa901c49354ebe9
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 16672 bytes
SHA-256: b0699742dba1a746a6698a197503d2556a846e5925c717989b378daecb0697ca
font_03_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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