Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3335d95f06ffa9…

MALICIOUS

PDF

165.6 KB Created: 2021-05-10 00:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e51f7d2657807cf36cbb8d5a08a63a4 SHA-1: b0ea9b3bd6fc7df8ea55105cf7830e41570410cb SHA-256: 0b3335d95f06ffa94d120f8adbba69f3f0bf9a1014fd9d5cc4bf4b82acde3014
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/26077caf5d0679169b9f9c29e52d7204/megurokurobijak.pdf
    • http://analogsys.com/uploaded/file/1096921084608a562b445e2.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/401e9503ccac676d60c37ad179ed505a/bovogodewelunu.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f5dd9fb754818710016271ec405d663b/39301835675.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/p17nnjm33n001493kvmpfuldvl/84706929153.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/135050e48b19e88d1f28b849fe4a3c12/92758167732.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f54005af177176c0d21258356a54c827/57485388016.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/29535b60f680a78bf0a361ada048158f/pudoxejavubepux.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c9bc6bd1---77767429575.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925eb018c9f---kamepaxojopetipo.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf9b10600---pafevuzajopigakalurogo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0a147d7da79b2d3c1a2e9c95decd33d3/fikabigeboxil.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c809371d---68241941515.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607324043fc9c---23891320419.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/d7nkka6ghusof6jthah2fbl625/82075094091.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4hp2b1l4cj030uakvaqpfb6a2v/16362433229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=healthy+active+living+textbook+answers
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024e03.bin
e797764f905faafa3bc4ecb0599b432d079e51074e16bbf78098105b83d710df
pdf-font-stream PDF embedded font (sfnt) at offset 0x24E03 5548 bytes
font_01_sfnt_off000260f6.bin
e301600a791bb0b43d1151da59017ae5c2aa75aeeb74cee585e4388b8c589455
pdf-font-stream PDF embedded font (sfnt) at offset 0x260F6 11820 bytes