Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce47ab518c14e24…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 20:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7c3714fa219c3aa12417023feb38afa SHA-1: 862191f1d9b0327912f8a1608dc18d26024b3d52 SHA-256: 8ce47ab518c14e244432d79dbadb327bde674ce8780b4760a117f596ec13788a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=ben+10+power+trip+download+for+android+free+download PDF link annotation
    • https://akvaguru.hu/user/file/dixemowizaxolivo.pdfIn PDF document text
    • http://jawarakreasi.com/file/xodinapavagukuweju.pdfIn PDF document text
    • http://fruitsad.pl/images/file/vajip.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7a6a9cb7---40500164098.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/40405131955.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/76964499550.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0178bff0---kofiwopilirelek.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/99058813705.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d438d18b5---mesoxarisetadido.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/risumebafaxitibebutetufoj.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/96665653025.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/37675036103.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/fafimuna.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/webumopisotezos.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/50541538516.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/befiwena.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/g36r4st7bo3qcq0ptqeuhadqd4/43985167991.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/safez.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/85352446063.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/12512268773.pdfIn PDF document text
    • http://mosjob.ru/images/file/29638444301.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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10636 bytes
SHA-256: 0de3542c691ecd8f6acfc5f004a8e915a021449b742582c54c087f19665a9123
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 19708 bytes
SHA-256: 8285ede5ea4129a59bff9c0b05bf51cd503a3ac1aefd1564ddc72cf4499891b1
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1