Malicious PDF — malware analysis report

Static analysis result for SHA-256 33df5f0602de6d91…

MALICIOUS

PDF

70.6 KB Created: 2021-06-09 15:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2f6e88fe5debe0a80c095551b41dff6 SHA-1: 0e232f6f4b97e0311c01bf374ac5fae1a0108f53 SHA-256: 33df5f0602de6d9135bf558852d1e72447ca361cca7d3e316a6a77d73cc4d885
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs and link farm patterns, indicating its primary purpose is to redirect users to potentially malicious websites. The embedded URLs suggest a phishing or malware distribution scheme, likely involving a link farm hosted on compromised CMS uploads and disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=fnaf+freddy+porn PDF link annotation
    • http://ahcxdq.com/uploads/file/290224105534.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e045e8698f---lonop.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160988caf95690---25845482668.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/29765297169.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gotapepatep.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/zujove.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bbed70fdd301bde5a4e99eb677481886/4173749060.pdfIn PDF document text
    • http://short-story.ru/upload/file/vutigofejip.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7fr8422eleause4rjd11flmac2/vaweki.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc5256e5d5---83045751940.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4fef46v39efidelqbt2f8deai2/65455637633.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bacd1375fbe8a4af98c9b14a096af71c/xafimeruxujuvivorolezope.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d7c5b3f3---nivugire.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/07a5a5e715b5b99c95c3a99e749d6e85/44387337562.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file/%5C/vezanevulexagilere.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/dd11b7de5f7a541c7e7c7e4b3c96fdf6/fuvoguv.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072eff8d811e---lejedunajumijewogefaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 4884 bytes
SHA-256: 44a009010e1b202045cd1b84a4dc9e8eb6e4241ac351c9bcf23c781976758836
font_01_sfnt_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 10652 bytes
SHA-256: 520d0812fc005cac440d89f24fb1e63a4042a6b7b7d6a503345252b18b49c76c
font_02_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 1740 bytes
SHA-256: c3083234ffb6d861bab5d39791d58a5de51bcb1f3d85f264bb0581569c330447