Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdedaf0464ef363…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 03:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3331a2c0a3ed1dbe5854af9003575039 SHA-1: 3e96e38d946a22e02c4edcee2d0af63b9aa34c28 SHA-256: ccdedaf0464ef363b3598c6e7fdd6c8d66ca6ab89e8dee6d035a42a11d72bc57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=identifying+inductive+and+deductive+reasoning+worksheet PDF link annotation
    • http://crisismobile.com/ckfinder/userfiles/files/kutel.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/49575290731.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wasubudejadudapoj.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/logixokajirozabitiw.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zibewowabixidimena.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/nizovulalodima.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/13561744424.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/temafibirekino.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/cq72u4ga53p7jo300s2s655dpq/49460252766.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d58c98356---87203401457.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dba95b5d940---45176244573.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/95912594269.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/82650560929.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/69266541277.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/15897973686.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e29b1a75f---95368459255.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756941098ef---40188395497.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/fapivokonalonelejut.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/roxisefiwolabeg.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/ruxisixafegosesiz.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/tijekezedavaxepatuloguvet.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_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 17104 bytes
SHA-256: fc71b532deee8edc54f2db7e90c3fa9ff8e6fc4b9ce462af11b27b0d86c0d440
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 11116 bytes
SHA-256: f8b8a8aeee8250d9e7fe238d94f900c479c7d043f383ea5379964643b2af63c9