Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae958d8ba09380c…

MALICIOUS

PDF

90.2 KB Created: 2021-07-04 01:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2584e713f9de6a20bb4283e799c968c7 SHA-1: cc385b4a4b264482d8f006dbf4423e6be83d5d61 SHA-256: aae958d8ba09380cf6176c1aee6e966984a09d1ffbcb10705ed113394e1aca17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8415fae9d4---53255228153.pdf
    • http://tai-group.com/upload/files/dumexojoraguvukimebuxi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85d9bfa5b---92930318228.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ea0ddfafbe3b09645f6cf63131accf0c/51915730987.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6gtnpgk51g9i5ls4o4oo9mhg93/42111193828.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/d8c64his36j51admq5jlng51gl/kijefilolikujigusizon.pdf
    • https://art-lamps-rali.eu/files/file/38860014225.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8621fc009b3084266d5266d44da17ff5/16401533755.pdf
    • https://n-zvuk.ru/upload/file/25039652104.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa871e20584---63556038339.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vj2c4aej1qm5e24ge35v0o8hm7/fonexonugofixoluken.pdf
    • http://dlevitin.ru/fck_editor_files/files/1128607896.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d6acf631---kutezomus.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0282873b26---jivofijomejuragi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6be2e9b6fec4ccf576da29c577d588fa/bedalinepazipokovu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd064e9bb8a---ninetunatajitotadeg.pdf
    • http://heyumpnd.com/userfiles/file///82642622961.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c5dea2bc2198b155fde5e9f465877c24/54010923139.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/48a357609c08513ec0bfcd60f2dfa9ac/jeladukejufiresekugum.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8e8cf50a---12715292796.pdf
    • https://casabresciani.it/uploads/file/kurarobamiraba.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2bced4ef02dcea24aa8d17f3ce40a88c/vetusipipuwora.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/bbad4df60b177423def8402a57b0267a/70870039028.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+parable+of+the+friend+at+midnight
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06b.bin
d2032324541f89094eb029194e6a9f08019980e7fceab66cf75d6613d30ba91b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 10880 bytes
font_01_sfnt_off000108de.bin
dbf5c834edba8e78ba2224cecefe0aa14d51a0081b8337a6b3fabf3b2e8275e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 17112 bytes
font_02_sfnt_off000134be.bin
f3eff37080451ffbc48ff67773b442b6d9ec7aa22cce85433ed00b0c4d8d0179
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 3028 bytes
font_03_sfnt_off0001410b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1410B 16792 bytes