Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd059744efe346d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-22 19:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89329677d8263a3cb1190f6f5cf7cfc7 SHA-1: df2cc303a7d56821ad6a131a22a7e6e029edae45 SHA-256: 6bd059744efe346dbec81ac922d6ee4d95f62d1497ce7fc3a8790c89b509b085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload storage or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://drafthe.ru/uplcv?utm_term=cydia+jailbreak+android PDF link annotation
    • http://cpghollywood.com/userfiles/files/zudamudezereligofadebiv.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/gutopisojawilar.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210910_091011.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/kepovelozezafida.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/resijixafupomoku.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0a62d6a5---dimagagexiv.pdfIn PDF document text
    • http://salt17.com/userfiles/files/dinutiloj.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614257e6ef87c---11576865734.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d8b27f6cf59d327322b7249ea82b55fb/jotixiv.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/pivavakaw.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/piruzofaluvin.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/dibijobepaxinonevezaf.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/73266114649.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/fowobaxadipexixamopas.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/46587244423.pdfIn PDF document text
    • https://melz-feu.ru/upload/nonogaj.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/mivaperipefejigojel.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/20982276357.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/93774926426.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318cf495a90---73276874141.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/98576715104.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/68725084899.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbdeb44a3---38781632556.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/dutom.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/52656466985.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902210850.pdfIn PDF document text
    • http://cpviettin.com/upload/files/punekerig.pdfIn 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://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_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 10480 bytes
SHA-256: 8895f16a9991ea48b3855a8b78a4ebf8397f44a007e43cb5885e2512073e1faf
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 19992 bytes
SHA-256: a259c66c69db70d0855e4fd68cad3a57be04c1b681612edf851587e5cfc7bae2

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