Malicious PDF — malware analysis report

Static analysis result for SHA-256 694e43bb050293f7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 17:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 331e07e20f98561136b0405339069961 SHA-1: f66f39d59b3e50837be27971dfa00ae11801a694 SHA-256: 694e43bb050293f7769bdd52861bfe44c1a75f59ca1f5d97fd1eac370b5cbd00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised or disposable infrastructure, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI links and link farms on compromised CMS platforms points towards a tactic of leveraging potentially untrusted hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://energo-market.ru/sadm_files/pudajuxus.pdf In PDF document text
    • http://yuanjiangchem.com/upload/files/9771269639.pdfIn PDF document text
    • http://quinta.cl/upload/files/80629057947.pdfIn PDF document text
    • http://spbi.cz/res/file/zezenaxug.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/gekikafadifeguxunofojikij.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/96001251349.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/kutorag.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/ripokamopijunuruj.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/voluwo.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/17903017708.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vufajobefane.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/fc2464157667b85723cd2df32dea7fca/32949209697.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/xabubukexewivaz.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/bidow.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/24105467878.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/19656037400.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/fikifajukoxivoma.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dee5291eac3e883a69b4dc263fddede6/73369106375.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/33727207751.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613146bd2f789---54821510145.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/61690416412.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tixurapimasafisasutix.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xitebav.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/2191198722.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/2035592732.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/14783859704.pdfIn PDF document text
    • https://fishboat.hr/files/tuwaxiserevofopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dronningen+full+movie+watch+onlinePDF 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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10868 bytes
SHA-256: 17b83a55c865613c3b4ea164b056c739d2731d9c637b0f181d2f80ee8badbb11
font_02_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 18496 bytes
SHA-256: cbcd081808d6705a0bc51f41a304f03a3d518f998af48a0b6621c5725b247a5b