Malicious PDF — malware analysis report

Static analysis result for SHA-256 40634479887c3f1a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 21:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe223ce552868cbf41170258ec92ccd0 SHA-1: c576f9c1210e5b8dc1308916f031d62a7a455116 SHA-256: 40634479887c3f1a7b2d52410376da0ef8a8486afeb831b606050f850ee29e10
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The ML classifier also flagged the PDF with high confidence.

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 https://infrive.ru/uplcv?utm_term=low+spec+multiplayer+games+for+pc PDF link annotation
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/nefolupaserodag.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/ralojepulazo.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/pimajagamojutusegumex.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/nimiperologuremuvevuzosu.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/vovuzotoj.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/tubapuf.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/6062744770.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/32781641770.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/57500111463.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/79799931878.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03b101cf3---pedurinudisulusudat.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/3931915285.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/lojawurad.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/kadorigu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfa0a2652---97531619567.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/tasosodoxitanugoxevenemip.pdfIn PDF document text
    • http://tyextractor.com/d/files/35548528052.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/rafaxalera.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/ritokiju.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gabiwiletukapabovixoda.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48bd2a7db1371538f8282fbdeb7c07a/pidurowenasalapa.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/19627954774.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_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 10976 bytes
SHA-256: 355ce14f67267fa82170be2f031e404b6f919557a241eae23b557b4a4234a688
font_01_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 17408 bytes
SHA-256: addf3ec9b0c677a23176e16b399e88ef57587336234627eb0f954f36a04f9811
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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