Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b3a3a54071a2a0…

MALICIOUS

PDF

96.9 KB Created: 2021-09-02 23:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e36f64bb6f6a81b51ef54a96502a6edb SHA-1: ce83ae36ed173ec775a49a0dc53b25b94865b43a SHA-256: a7b3a3a54071a2a0e71b93f604f2d87d4f2cc717d78ecca09a91126ba9ab69b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f2fff06e8a4f4099fe186d59e6956ccc/xebobaduxevedunozawofeko.pdf In PDF document text
    • http://shs1977reunion.com/clients/41590/File/14066356085.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0ba6b333---76784064826.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/47252219226.pdfIn PDF document text
    • http://fullx.net/files/47597656188.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f012b30bdcd---80236115858.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4c3fea50e2c77b3a422c13325ffc0e6b/wafekim.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/52609963402.pdfIn PDF document text
    • http://texmet.pl/userimages/file/diwadidujasa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160733f2181581---lavavepisulokawinipufivid.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/75112199454.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cac9465891d37748c13fce4026bebe5a/lukawurufo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b15ad2c029f---fomononuzo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f256d69e8d8fb7535bf2922a46f3cd24/11666228358.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ffda6bdca807ff46a6dbbcafb0986a1f/65837985738.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/76237492824.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/37811334891.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xebuxakoduzoz.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a32a9a01910926a3b47e1875bf8433ab/70033110671.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/61914568117.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611c82cc86ed4---duvoperamiraxof.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/kekuranexinifeduvojirawaf.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/79226310090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=couch+to+5k+pdf+planPDF 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_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 10584 bytes
SHA-256: 3764c8fa01cfbdf29350c05cffee63b4f34c049444b7472f6b2fa3d8565866ea
font_01_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 18376 bytes
SHA-256: 2855c6fca57061d71738eb0ab8fdfc30c01bace722738d374314a36740f16407
font_02_sfnt_off00015d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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