Malicious PDF — malware analysis report

Static analysis result for SHA-256 c463c8d8901e6b2c…

MALICIOUS

PDF

83.3 KB Created: 2021-08-16 02:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e102b0a1ec7da38ddbfd0f8e56c7d24 SHA-1: ad6486e3bd5909bb0cdab6f5eda530c97b1a129c SHA-256: c463c8d8901e6b2c9f14d007f952514bf20f3cba9ff336be94b9791fa3c7b8a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3444d4811702158cc08cf9e7928dbad1/59673436326.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27027077982.pdf
    • http://banlinhkienlaptop.com/userfiles/file/febokarupoxotofanujojurij.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/78acfb2f5ed30b3d9dfdec770df9ced4/lolapebaverasaxuvemagabum.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad9e0322b4---fovadoriwavi.pdf
    • http://fairway.cc/images/blog//file/nafaduger.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/wugus.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/abb84c991ed94ace52349576d51e87a7/zemesupidovilikedipax.pdf
    • https://uclerbaklava.com/resources/file/99485193381.pdf
    • http://on-video.com/movies/movie_data/file/87634810155.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/tojujaz.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/61o7bbnit096dda1ui07v3k81t/fovedikiwixijoxavededif.pdf
    • https://equinox-e.com/upload/files/gizabimosoxerurik.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097888925ce2---98714983257.pdf
    • https://campermagazine.tv/public/file/nuwafomotim.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8936fc37a0---konagur.pdf
    • http://pappteam.hu/userfiles/file/81043794543.pdf
    • https://accu-split.com/userfiles/files/lonirotab.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db05787d039---jejekozilurafapoworozogi.pdf
    • http://ahzycw.com/upload_fck/file/2021-8-3/20210803114553625452.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38f0878ca---vofinereso.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fguoc3re2neik1503fr11dgae7/37226498938.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160982738bf664---xogafidiboxefubabeti.pdf
    • http://herbwaterthailand.com/userfiles/files/nolesupudifedujuvenujusax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=acid+reflux+diet+plan+free
    • 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_off0000e4aa.bin
77550fa34141f675bd95731c57778eb9a8dc93f6e3547a67a3470ae457e5468c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 10508 bytes
font_01_sfnt_off0000fcb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 16792 bytes
font_02_sfnt_off000114c4.bin
bcb57ff0151c4c377454c8a6930da95102ce2e53f5217851129b09918ef31e27
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16528 bytes