Malicious PDF — malware analysis report

Static analysis result for SHA-256 3756d72e61698e22…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 09:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6368b2fd70e0431becf16660cdbbb89b SHA-1: e2817b065f416fcfe8a4da85be598879728bc80e SHA-256: 3756d72e61698e22e31e961276cf4d93dfecfeeacbd82d8bad74b26ae5b33bc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=landlord+and+tenant+act+1985+pdf PDF link annotation
    • http://quartierdete.fr/uploads/fckeditor/file/34770560823.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/pitotajo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c161aeb5934---jemuwulivuwowivajiwi.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210815104347.pdfIn PDF document text
    • http://bulmarconsult.com/files/kaxazawewujepepobof.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/8882029511.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/de1674cb7f38f9811ece1fdbf671148a/daxokiwikekuleraf.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b547e79bee---menumibixalika.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/gutanaxozavapelozonad.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/wonegabaje.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/40013474968.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c432119a88---zatopegibazubas.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/482007a3caf3c4d6dea686bf802d5033/3980816446.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/dekivijer.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/31809365056.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/48278997420.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/gipodidopawagozur.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/6143628919.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd044fd75---28199422916.pdfIn PDF document text
    • http://bakefruit.com/uploads//files/202108102204412495.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739982cd41c---wonufudoz.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/29601847620.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/59538059079.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/durobeguwok.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16127579926a31---22106346122.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58369521f---kamuzaresu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 17816 bytes
SHA-256: ea2589495f5b3c1d97fbc770b4b8e94ee6acd35a6af2620dfecb096116456bfa
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10872 bytes
SHA-256: 7bc2ffd46e820f5cd6853b73ea890b48afdfeb07acda442548dd34070f14c3c2
font_02_sfnt_off00012710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1