Malicious PDF — malware analysis report

Static analysis result for SHA-256 461136cfafdcf171…

MALICIOUS

PDF

83.3 KB Created: 2021-08-21 03:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a384cc12764f49effaa2cdd1e800ef33 SHA-1: f13c0527b87f5cc25ebb3acf5a12b1848025b5f3 SHA-256: 461136cfafdcf17178f1ac0a2dfe8d83df9ab80f98b5d1a41c407c8de0c17d26
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage or disposable hosting. The embedded URLs and the document's structure suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=serveur+minecraft+pe+rp+fr PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2o13k0hctob2ottlgvs3vl7063/68428638033.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/96113041482.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7256586c0---72270452824.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/42484082905.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/1f423ef05e6c4dc426bb865fb88715cd/vifogebobaremebudewipivo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af5c1210240---wezuwekuxabamofevij.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d146491440---wofut.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/pufanat.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nazejamisikurusabavop.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/18111751433.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/tarefabefudigonu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/67183255364.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/5748129620.pdfIn PDF document text
    • https://camelcarpet.org/d/files/vazebigavevitemigago.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43a5f318b7---56765823127.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/fugisutenumubati.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac575c9fb23---vaxug.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/43680894693.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/13332528588.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sh2q19csj8m699g2q4s0p52326/51165322383.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/72417387323.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4c11adba004d07d0e92334e493568648/63073229928.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/51442574584.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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 18380 bytes
SHA-256: 3fdce1dfaff560b5c952a21046d6f0c098a3211f41cf4d83cb9593a93621824d
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 10548 bytes
SHA-256: 4c56cd21ba935c3ce00674cca612a455e07d6565211cf10e4e4502a718ae9ebe

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