Malicious PDF — malware analysis report

Static analysis result for SHA-256 559eec944137a1cd…

MALICIOUS

PDF

94.2 KB Created: 2021-06-26 09:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b6aae0fb70e3852f3d0be072fb45539 SHA-1: f69046417c6128edce0fd993dcbd0504b70ce57a SHA-256: 559eec944137a1cd1c288a89d697df3cff85f7a3f1c715073cfe1a0c48db5eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential SEO poisoning or spamming tactic to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39f091e270---zazugirovubi.pdf
    • http://maychamsocda.vn/images/userfiles/file/11832361451.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f1443c7a8cb1f8b110a8f3fee714ff4e/70467327467.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/80ba0765afffc9f1a70ebbed0546dd57/42088458605.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52f88982d---81745556411.pdf
    • https://amitadevnani.com/userfiles/file/22594752786.pdf
    • http://englandmatchshirts.com/assets/file/jaselalobavisaxejeb.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608289c2c8a23---42839530361.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a9151fbd35828382bfb3049e26a886d2/jadesajoteginatexukuminog.pdf
    • https://angkalaris.com/contents//files/zaxapeluzisized.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4249df457---jibujifawawojoxe.pdf
    • https://htchninc.com/d/files/54972797053.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4d2358a574c80cdde0d34a0f27a20a85/20626774594.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e90b259fa---42216266743.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13066ecee8---jeseforifesokuzizexuguse.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6178b671ee70e5027bdbc057241498e1/48063961526.pdf
    • https://curewelldiabetes.com/userfiles/file/37532856861.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c8502c5c---resewoxapumebuti.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7f215f0c8f5a104d7d6e40bd3f9db9b6/wetujujagusutemisanoz.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d399305193fe608a4d556bd676e4d99d/10080952006.pdf
    • https://banghenails.com/upload/file/90972480151.pdf
    • http://auburn-properties.com/userfiles/files/rawazulaw.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d4e11294541022e6bf298dce74eba0db/13352218691.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34cb6766f---85668481368.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+aftermath+2018+full+movie+online
    • 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_off00010bb8.bin
2b2b2d2731e8287cf7d75116821f8e43724220dd7a21f189430e80929b708279
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 17636 bytes
font_01_sfnt_off00013a08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 16792 bytes
font_02_sfnt_off0001521f.bin
ee4988bb39658643022b4ae975051f19994c3d6cb6f2e47e803d3c15b6f62bd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1521F 10944 bytes