Malicious PDF — malware analysis report

Static analysis result for SHA-256 86de28b8bbb1c65d…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 01:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 325048fcb1583d735b2dceca2b18bfb5 SHA-1: c683e82894076fb323cdf51bb1ba5d9764183d7c SHA-256: 86de28b8bbb1c65d71acbb5e04f2cb47af023735a4d4c9319f688a77d7774634
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ytlcases.com/userfiles/file/45756351247.pdf
    • https://communeouchamps.fr/userfiles/file/9808570117.pdf
    • http://doggystylzgrooming.com/admin/photos/file/vofuguzopirufijili.pdf
    • https://aartipalette.com/userfiles/file/daxuruwuwebonasoxagog.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105270626466385.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/67f7876408628fd56d2386fb161aca19/tenizib.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742dd14d805---pasabobukotadunapa.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/ramanovot.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6ea3eeeac67856860716088b7b2b9e85/23453466781.pdf
    • https://cgeminfos.ma/upload/file/faxuwidukin.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/p8h8b6m2leiiflic82kt2l2810/52496163429.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cdd3c4300---ravesotovobuj.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c350b75c5e---10717998486.pdf
    • http://forter.vn/hinhanh/file/wotose.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bb8b3494---gibaraxemaxelim.pdf
    • http://kcde.kr/userfiles/file/nodubigomuvokazabuzatibu.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a165901b87---jabufaba.pdf
    • http://feg.vn/uploads/files/nikoxujelaratikeninikulaj.pdf
    • http://stjconsulting.it/userfiles/files/kigalujitejedifegajisun.pdf
    • http://alfavs.eu/userfiles/file/viwipebizupisoloxu.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f65949a66---52404115850.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ceb392ab0---57800408154.pdf
    • http://lakehighlandsrw.org/clients/863582/File/kunewewolo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hyperglycemia+can+be+caused+by
    • 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_off0000f3a8.bin
07a4d1f91224bfd889616a4419909940ef9e50c1f2c8a204a2998d71d06d50d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 16296 bytes
font_01_sfnt_off00011de5.bin
fcee983618420483bdd67e52e09031b3b1b3f5aa8021004ea97459882b051151
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 10984 bytes
font_02_sfnt_off000136e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 16792 bytes