Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c88d559401e72c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 17:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e53c01c34447eebf6a74250ad4907c23 SHA-1: f420528e29e48486c3e89fd513168e3f55882e35 SHA-256: d2c88d559401e72cbf8709852adcd75c0097d39de43c17e1266f4c381547a85d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://elskenecologie.nl/files/26461591524.pdf In PDF document text
    • http://seamcc.com/UserFiles/files/xasutadexemogigozawefo.pdfIn PDF document text
    • https://irantruck.ir/data/file/ledagej.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137df8c74496---86117926812.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/71553029797.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/suwavulopavelad.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/26893416741.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/bozoriweratezimuwudarele.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/46599695861.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/34277910666.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/38375584862.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf50d4163e---ruwojasefalodalokarakox.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/37155764859.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161497b0cdb8af---16604057726.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161497ce56c22d---vutemokefelezanova.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/ragidavopuxutudowi.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/63388804294.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ec8a339a527650ed10a95cba6d8d20ac/paxunexugilojeb.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/51181936213.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161492bd45a092---60235751377.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wuxofuxixadutagimusezazil.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/2363309471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=children%27s+comic+books+pdf+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_off0000afed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 16016 bytes
SHA-256: 86c881e4b2f0c70e5364441d23a7d3a83b452e41c91f4d08acdc98b9e46ca286
font_02_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 11168 bytes
SHA-256: 4ff6fdc95e1066b261a3e7f3690f060db73b51ae6ac3b61cd789b2ea7ec7f360