Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a2a591ded62201…

MALICIOUS

PDF

103.5 KB Created: 2021-06-18 06:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09743f627a5cdba25e0e3eb99007a33 SHA-1: b20d679a80b1bb6f991b9a1b5e592bc52347af61 SHA-256: 84a2a591ded62201251060d2f25d9a4368373dcfbb194fa9dfe098b665c247c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious sites.

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 http://anhuizhkj.com/upload_fck/file/2021-5-17/20210517082603803064.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/kmlsk14ersa2l9iepa5khhc9m0/14467993442.pdf
    • https://topclassgreenery.nl/images/file/laveza.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/024478ba889780f13ae5d96df7a38a27/60461240372.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f030798bd3---31442367807.pdf
    • http://ciarajewellery.com/editor_upload/file/lawotafug.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86321c04d6---sipefitotuvudi.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5ad64baa021cc1e110bcf987e526e9f8/silidak.pdf
    • http://rollfactorytogo.com/uploads/files/70740141816.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dcc647c3330dad8c1f1fff8bfdbbf47f/76854472362.pdf
    • http://anandtouristcorporation.com/uploads/13048281181.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a0fcb155e478708ac3b0886ba6081475/tunutuzosukaledezazibe.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2ea6fcbaad7478fca5a7703257bb8f81/jijofutubudipesavuwiwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=code+lyoko+full+episodes+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159be.bin
d466e0b926866402abb34a249c94f4b78de36af794f803fb611da2bb43f5da4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159BE 4800 bytes
font_01_sfnt_off00016a34.bin
30c45860aff27d63168dd791fd6b9c44ea292b411ec3b2b20f5f4805bc8eff2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A34 11340 bytes

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