Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f96ef7049939fe5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 14:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 139bae9fdc32ff609e93daa0628084de SHA-1: a3f4ba3ca5f502ac54b994a5f42ed51f7a2a55d4 SHA-256: 2f96ef7049939fe5a30bfdc08d0831bd1db319636e4aa82a76dc6b15d9718fb1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm pointing to compromised websites, likely to host or distribute further malicious content. The presence of a visual download button lure reinforces the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sieuthibongda.net/ckfinder/userfiles/files/kofatumapeko.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7b1eea6045c9ccce67dde9bdebd0314d/faberadoladujelu.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/dikovutekavaj.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/94953587666.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gewipovumenepevumegunifuk.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/60545069583.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_57006210CA95A5C7.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jegeguronepaginewez.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c74f416a86dcb3e070f968f72381c9b1/72929052925.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48677793275.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/xazigaferap.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xefusipovokonokidoj.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613918ffa2b43---38681503646.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/sutizotinewotukejavof.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lekirugubujiwodezew.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613589aac371f---95081296762.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/39361016432.pdfIn PDF document text
    • http://generaldistco.com/images/file/tejabiderawupamexiva.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/magupimaves.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/98028218361.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613180b3ec31a---92936495708.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/gejetujuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cabal+m+playstorePDF 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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 19516 bytes
SHA-256: 8a83fdfabcb1111cb62bd2c9518a3b34a2a743af699824da3681590f68b6094b
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 10504 bytes
SHA-256: 213ed7055080353925e08569750a7f97f4d50ceea30ff573652519c3ec2fc377