Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f14499807cdde6…

MALICIOUS

PDF

92.7 KB Created: 2021-06-22 20:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74813bb1bfd05db3a8ce8c9320baf8ad SHA-1: 3866a59392c1eaa8ed0b6327cf8ef41095f07a81 SHA-256: 37f14499807cdde6ea36157d847aed5e56e0120312fb76117843d4df5b6ee26a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories 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. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a14fc0252bcde4e7042ad781b31b99ff/xilugopofoferadusovagi.pdf
    • http://parzenica-bialka.pl/userfiles/files/77437476737.pdf
    • http://newo.ru/files/files/35836519830.pdf
    • https://damsindia.org/admin/uploads/file/nizufipizitaj.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/790717ef1b4e1b2c27a75709836dbada/xubitamimasexufeko.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/be9a2c0d5d9f8bae25ea73975f8313ed/saporudedapat.pdf
    • https://iwnta.com/userfiles/file/torifonopubivazigele.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087316438664---bowixawaginanafopomojite.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c332b370411---dojijasobupitenigexiz.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2n7cidqgdkb59of7eu902dg853/19910346615.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9073c4542---pefavijose.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82fd91e8e---zazoronopoverinudijel.pdf
    • https://calmoinc.com/upload/editor/file/tudipoxanibejubivukoriw.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668fda1678---83531854832.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bb03a4b7b296c23c9cf3cd3c6e10a7e9/loketogowowenog.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cbse+class+6+maths+chapter+5+solutions
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa03.bin
a33c11c9148aaba1f2d77be4730c3a4376c41f8e40c965b04d5b51715361a23f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 1996 bytes
font_01_sfnt_off00010352.bin
32282abaf86ed778464034c330c7b843ad289f1dc20afd06b60a4758ed51e2e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 5496 bytes
font_02_sfnt_off000115d7.bin
dc8e849fc2d1ed6f5140ffc2853c8077c1b0e3e3576df576b9c9e53e11137a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 12564 bytes
font_03_sfnt_off00013fe0.bin
0ee5581f5eb33dfb45252335dd6347ae8492222a48b1ffa40af976c2aac8c0bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE0 16224 bytes
font_04_sfnt_off00015527.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x15527 4324 bytes