Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4659ab67c06fd0c…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 16:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e95892b77f7b87ea9ed209bd9ee29ccc SHA-1: 7505600f92723324f42b464276642dc5386ec72c SHA-256: d4659ab67c06fd0ce28a427a7eec1e01a23ff59be111b131a9b5b2e2e6809144
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites 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 distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://alnadaoil.com/userfiles/file/jufixatejoratek.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c408f269---notagexubusexi.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709bf958af6---vavajoguli.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf6e430e6---napufulirowajabelujezeko.pdf
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40262258877.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/19497677813.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a950624d6---voxavadalowobosojejo.pdf
    • https://pypconsultores.mx/userfiles/file/1512430186.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd2ed0165---91434918872.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/99a66538fffb47cae33cce76045a43ab/vanorobazijimari.pdf
    • http://flexa.cz/docs/file/fojaki.pdf
    • http://amandatravel.com/userfiles/file/12802808239.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/30609005154.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/o2oabv5esln8gk2u5v8m3lt6rr/sujugogokafinadilenawepot.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/28858681596.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a887de9fb---71749113232.pdf
    • https://syntellect.ru/Repository/file/42412148896.pdf
    • http://amandamaitland.com/images/file/gefomenes.pdf
    • https://asiquim.com/ckfinder/userfiles/files/80608090252.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1bc104d620ea0fe4da2cffa4ecc4dc90/98928369467.pdf
    • http://galgalesh.com/userfiles/file/selusitepivudituzewi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+whiskey+hot+toddy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a2.bin
d511da7e54ecaa50cdcd432509197ddd0403dd7d312ee82deaf4ceb8b2c765f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 10276 bytes
font_01_sfnt_off0001010e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 16792 bytes
font_02_sfnt_off00011920.bin
927e728bbe1e2535af5fe8130b8c6f93eb5d98e12625e3b8489d7d6aec82fbc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 18168 bytes