Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27baadd1da41aea…

MALICIOUS

PDF

88.6 KB Created: 2021-07-08 04:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3999f8f4a30b184e09f066e893988561 SHA-1: f08cea1dfa2a82bdd951d8955ecef59ac5db10e3 SHA-256: d27baadd1da41aeaa35365535108e73a8d189d8216347c804bbe4746568539e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/h64674aeh5ppmrivi8an6nof9d/dexamexefekefetexifeben.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d350f2e0f5db275e2c6f610f89ad0fa9/59816766330.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/46110574073.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/95916378060.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01eeaddba0---91310963573.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/deruxotuzoxajekazejele.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072272934201---27040573067.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/852fec607d55f29a64a8c7bdaa39a91d/zolitelexexuwatodad.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/pasoresakojikujunujoxe.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/69778194145.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/41a03b8bf23d153a17227294602fdfaa/98690379779.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/be8062799e09c608499433ec199ab5bd/gavorukevebuloto.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/78b60691bf6522d5324e712707f9c931/sinevoxarinijizuremot.pdfIn PDF document text
    • http://mousike.it/img_ins/files/87369264979.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/kubogat.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ebdce2ce---denobebalumaxejejov.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/dikubufujizaxemif.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d96fabac4d9---timaderajasulesezuv.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9hmn01m31f05f2rt808cdhg0rh/xubogu.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/pugixasibu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e8183e40eb75ffde73f85944a9a7d818/sokeze.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/89ff9990b7456150d3614b6b1f8cb09b/susedekewigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ontario+electrical+code+pdf+free+downloadPDF 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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 17632 bytes
SHA-256: 3eb7adc25a398485b6c09ec03ef47703c5a9d68e91fc530c2a622497d5d1be32
font_01_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBF 10556 bytes
SHA-256: 5b79251a22194389bd6459f41b60f8913a8f76f67160709c9b2855e2d8d82b90