Malicious PDF — malware analysis report

Static analysis result for SHA-256 210642d93184cd08…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 21:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a24fae1ab21e4a89fb4cd9735c12dd4 SHA-1: 35addfec7be23dcf72553ee785dfed06d40da524 SHA-256: 210642d93184cd08594bda2edc3dc65c2b636d9cde90b6efb0a2878302bf9838
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The file contains numerous links to compromised websites, likely serving as a link farm to redirect users to malicious content. The PDF's structure and embedded URIs suggest it is designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=watchmen+rpg+pdf PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ca4912b81d0204f3ec593917d3842a1f/dezep.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/43d46dfd3982e31fd9fd03a49868f82b/76652210402.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e1721178---32626818496.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1955f9b3---digewewimeba.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/godabapowofugudijim.pdfIn PDF document text
    • https://mimpidia.com/contents//files/jowofovi.pdfIn PDF document text
    • http://webursitet.org/Files/file/wifov.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76569190d3---11621261708.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/05c45f1c7066009b0983f9d15ce7fe1b/juzed.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/75831891891.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/janonuno.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/23993308000.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/kawikuxefibijesubudox.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893d1a9866---jubexuguvononof.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44011cf4e---vomezarisuzakisisewubidax.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080548d1e047---70391597266.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/42354271307.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f61dc05b7---69174590370.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/puwupetusa.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/21886137829.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c7e1a633---wimamegifutunos.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zolakojawopuvagizofigaxub.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cdce75a245283bf737f9f602e5bc60f0/53437562382.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/dezuxigodoxu.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/veperegivekonabafiwez.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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 10632 bytes
SHA-256: 0aa4dcf1a69e2b61acd26e11b6575bdb2e0f9ca7c42778790e5e6bd98891d96c
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 18528 bytes
SHA-256: 630a1b0cc035c036a7e2eb9bbbb1253eb1035fc09ff520291b178704121a97cd
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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