Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0ab9129e7f74ab…

MALICIOUS

PDF

108.0 KB Created: 2021-09-02 00:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84837079f2677e5aabb102b40cb820b4 SHA-1: 2a72f04e7864f747d2b3092046d1462f7ca97111 SHA-256: 8a0ab9129e7f74ab1da2ddd06260ea0262c812cccc42f7a9a7da9645d2b67c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly imply an intent to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.peretprod.ro/content-images/file/tenoxigixumetoguxuduge.pdf In PDF document text
    • https://artbynela.com/uploads/file/jozutevile.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/49378884107.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077750ecd95e---1202336040.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/93691925246.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/suvisa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f7l6dsmkski9ciuumj6bbh90r4/76944843225.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/jikedelizagidodowofegupog.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528051353.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb0ccdf73---zovutilusudekalisotajat.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/de70c00fcd1364fe3b398dd0dc5a466e/62854860443.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/beguvupil.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/97c44c19e58b1d23c4ecdc8262350ba9/gojotagorexufof.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075db048e361---35365655956.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/epi6c8lbuhfhahdvpgacm9mps5/16174128096.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a37f0f3153e954d2c3470bdccb17b6e5/98482719473.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c7542248---69576095273.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pm05gmjvb8qg2j9gb2c018s8jj/jarufovuranugup.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/31580049038.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/kewumomefenetuxaka.pdfIn PDF document text
    • http://lucann.com/Upload/file/vizopitanusowugixar.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xogijolafozoxukukera.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b6da6fed4339d9a0f3ac032f47467f39/40801166313.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e118604f1e528ffdf8b02e5cdc844f4b/gefevuduxubekigefekube.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/vamagemegopabufe.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/7159j50imt6ip53vo9fcuhb4d5/vorisujux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=macroscopic+structure+of+skeletal+musclePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001402b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402B 18780 bytes
SHA-256: 6c9f8466580507bfcd920d024adbb43ab70d769a6a0d80e362ee63adbacd67bf
font_01_sfnt_off00017034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17034 10720 bytes
SHA-256: b10d602081353ab146da9029419374ebf2e5c9b9c1dc0f6b990b97adb3ac0869
font_02_sfnt_off000188ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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