Malicious PDF — malware analysis report

Static analysis result for SHA-256 c267e6a4f7d8b038…

MALICIOUS

PDF

87.2 KB Created: 2021-07-30 18:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df040a0cfe1ee9acd1cbe2a8427e896f SHA-1: 64566d477e6f88388d4a9aa5fd23bfe4a2c4b3e3 SHA-256: c267e6a4f7d8b038b848b2acc894056ea28bc27d156956a7d59d76c25cf29ad3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting. These elements strongly suggest the document is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=who+makes+turf+gard+oil PDF link annotation
    • http://growlink.biz/userfiles/file/22405228434.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/zubivivodofodesawodal.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/35751185751.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/42905399935.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607785793acd6---89833717646.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466f17af60---fenajotivunafapazu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/423711655a40eae6620a61d75520aa38/16207634138.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f3b0a34edd7d38650ec0d2f8a64f7903/8749139339.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lafefos.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/11ec05fb63b8e3c0785f54ce93ba67cd/71316248242.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d6f0b52aba4---56427706999.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/geputanifo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/wokuzokagulofasiba.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9f0f4be64---rebujexuri.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/69044095948.pdfIn PDF document text
    • http://gtshotel.it/images/file/kosazifitomakij.pdfIn PDF document text
    • http://kasargod.net/uploads/file/bojujiritakorifusedo.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d0a0155a---89143981534.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/321c52505760c4f5112153e49a2967bb/20476114830.pdfIn PDF document text
    • http://llux.vn/uploads/files/talemorew.pdfIn PDF document text
    • https://tessuno.com/upload/files/60fb2c2879a96.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/golamedarexusobadevuf.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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10884 bytes
SHA-256: 3e6f50dc3a0e986ce6b3068dc88190f2353f6f914bc57eb1cd90095a7fcea27e
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 17032 bytes
SHA-256: 88cc811f1afc44b1c22d415d48225221f3c62206297b18b373d02daddae12692

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