Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d705a5b0587f1b…

MALICIOUS

PDF

127.2 KB Created: 2021-07-23 21:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 130fcfaeeeccce6c8eae6afc199297c0 SHA-1: 9bb076e3361d4089c4b75d7da6b5ec516ef48136 SHA-256: c8d705a5b0587f1bdb3e13d1a7a10cb3734375fdd0de31be9951125c64006a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa120a20fc5---meremun.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ctuu9o07ukinpptr84p5d68452/15242649392.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/323580d40ad881cb699384fcb9381eaa/vuxuvoxares.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/48900c7a62024e9f26371542046beecc/18951769585.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/89178668909.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf13ffd238a---dukubosogoza.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/78951166880.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39aade79fe---47183632236.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vubigemunevovovi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160876643aa082---12267965741.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/93777798840.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/30359920658.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jto3ak3i1c8qkalof8vjrd5du1/tejoganuxajafonusikoxukod.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/wisuposijafemeku.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/53755958325.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7c440e0e837c2e7db827df0f5cc10ba1/4890989097.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c08c14e2b8512a3b430b85488de4e16b/62182923353.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/77226932339.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/bujavefiked.pdfIn PDF document text
    • https://cargotavio.ru/files/file/katekefen.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ff0ae3b57---56728630050.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/sufiko.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/906c42c5a7185c4895ab85ff403d8fb1/gononejevurofexikitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+earn+money+virtual+families+2PDF 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_off00018f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F19 17360 bytes
SHA-256: e70154e4bdfb8b2834cb11f92267687f6a79331792f70181571fc48a92fbc663
font_01_sfnt_off0001bcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4D0 10852 bytes
SHA-256: 6a0b53cfb77ea078ec2d2414e36666edd3106638661459539856cea0f174556e

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