Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b0ba4ca07c4c16…

MALICIOUS

PDF

95.2 KB Created: 2021-06-25 12:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7741d2d002f2d75daced8e4575478e57 SHA-1: 2690d6c863a59111f956561682f258eb52d466b2 SHA-256: 22b0ba4ca07c4c16fe60c3af263216e4aa15a6eac9c50a9ee7f7e740a6eb1add
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and potentially disposable hosting domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick the user into downloading a password-protected archive, likely containing a secondary payload, thereby evading initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=mikrotik+rb951g+2hnd+manual
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1a2f9540c2ade1600b637b64e85ce3f5/tarodekolibaziwesaridor.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6815cca6---94502748948.pdf
    • http://etpatatietpatata.com/userfiles/files/bugolewibaw.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9d4de8034b3e83de17b907453afb715/22413588465.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/dncbsdmm47nrgbqfml1fm2641g/rebobilabosugejakubusunoz.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10a3a8146---85443573885.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4447f739ad266347a3407e502627e3a9/bafowotiteb.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/55828432785.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/984ec3295f1bc834c7086b6f5f90b613/79028260764.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/34462004016.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/39a6idiifb2vp6s15g7ruqvce3/wokunowi.pdf
    • http://aftckwt.com/uploads/file/lufuw.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52c270a039---9856032522.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795ba704c2---gojunog.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c5a98c048b529d252e22a5acb3b9cfe6/39357066457.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665be2b94a---21479896663.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083baba90b3a---jabebutikarowuvuwu.pdf
    • 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_off000109f3.bin
96eb87f42174122fb56cda91967d5b5f9acf0f69be1604ebccfbbbf04cc5f36d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 11192 bytes
font_01_sfnt_off000123d2.bin
bdf656cfd8c8490fd02d06743e6c646ac0ed3c4b5cc19e14f02163bc00fba381
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 19360 bytes
font_02_sfnt_off000156bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156BB 16792 bytes