Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83fda1e3ef50b4f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 21:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c307de986475d967c30692805f55c006 SHA-1: 4e74cbab7fbe0ecd4740bf5e13d0513a2bb01a0d SHA-256: c83fda1e3ef50b4f01898371af1a2a7bce2978cdf81ceaa98a34671185b8e5e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. This suggests the document is designed to lure users into clicking malicious links, potentially leading to further exploitation or phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6e9d60456---92405381196.pdf
    • http://gleneaglehoa.org/images/file/totijozes.pdf
    • http://apvn.info/userfiles/file/35453626618.pdf
    • https://chmelo.hu/sites/default/files/file/61774624943.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075caeb2e1da---78111862410.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xisilavorudibirosaka.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb07940383---35927592766.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ad3a4ad265d58f18eaf302b7571dbc11/zetini.pdf
    • http://carnow.jp/js/upload/files/41014730712.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/p6tq8e7a2hi5ad98b3sfcfmo37/88290118340.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc305945e3---dedivowasopotem.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160732bb36f36a---kovag.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/61108971694.pdf
    • http://perfekttorun.pl/pliki/datalomusaveruwerotaduf.pdf
    • https://asi-filter.pl/files/file/nabebujaritifatubej.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/98e6054219e11b5e6f6fa4e3499ae16f/94575503464.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2eaa6ec5a0fc9fb3802301cb7b0a370a/64288910530.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/da33b15e71f2f4b9cf3c30ca9ad89a30/jiwejagewuxejeju.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/85a5d611bb929e37894c1ab62353972d/7269422692.pdf
    • http://xlsferrosilicon.com/d/files/marelijaratebufudumexe.pdf
    • http://www.predia.cz/userfiles/file/sonetujilebazejob.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a80440a44815a503ccd9c57a7a0e64e1/55488680656.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+an+inductive+effect
    • 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_off0000eb5d.bin
f786c88505a40c83ce78b6bc1c7e0baafb436eb1c1fb8c4313a1d536ceb14127
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 10464 bytes
font_01_sfnt_off00010320.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 16792 bytes
font_02_sfnt_off00011b32.bin
283cdad67ffb9e3e41d06caaaf437d00d8ee0c3a1f1af25025b3e2d1f769cfc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16744 bytes