Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6f54c8905b0693…

MALICIOUS

PDF

70.5 KB Created: 2021-09-08 03:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8164af409f77a40bccc82d50b0d83061 SHA-1: 8654cca84169fdc9908d35cc866a9cd2889ab041 SHA-256: 2c6f54c8905b0693cb77407f678d133555be62de6b4aa7da0152df64228393eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sharadsangam.org/UserFilesTwo/file/53905198762.pdf In PDF document text
    • http://cz-synergy.cz/data/file/gumowujalonoxexukexakota.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4fc2if7eq59ieba8vgpne91nv2/58825346784.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9fedcfc60a317d7085fd041904b3d38f/belevugutovilox.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/gokenimememijasugozigezug.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mibunevaw.pdfIn PDF document text
    • http://rapet.hu/files/77577086293.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/96156502067.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pines.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/118640a413962577f7304cf9dfd53d6b/tufizosa.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7604f0ac---seraraw.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ev1kj8a1d8bneb27telvvd9kl7/faxuxotopuxedixated.pdfIn PDF document text
    • https://ottopianos.nl/files/64851951260.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/zorena.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3e512ec509e402139fec55e1218bd398/tuvafexefuxanojifatigonak.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/13668264251.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16118e31d452f8---gazorukarakitasadu.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/39356856597.pdfIn PDF document text
    • http://gyobel.it/public/file/23205106781.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/likisewopopujom.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/49378645038.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/bevuf.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/2060301041.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/40919478534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=humayun+ahmed+books+pdf+josna+o+jononir+golpoPDF 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

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_off0000b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 11416 bytes
SHA-256: 27502ee21e6149c178295a4033e18ec206216a242cc03f0561b6d79977812f1e
font_01_sfnt_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 15756 bytes
SHA-256: 5a2c8d478f702cb15571cdbfa1ad9fb565bc1f9e9edbc09f33ba1d0efe71642a
font_02_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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