Malicious PDF — malware analysis report

Static analysis result for SHA-256 394060ea0f54ef9d…

MALICIOUS

PDF

90.3 KB Created: 2021-09-01 17:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f49e597a9e5789249b6f428ed9d1f38 SHA-1: dbed7c767091fd0b6d281476bc86b2b25c7a766f SHA-256: 394060ea0f54ef9da6fb8f3c1b0c28f5ce0077dad6e406431e5b831949ec12b4
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The PDF document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kaies.cn/upfiles/file/94863371901.pdf In PDF document text
    • https://newoptic.mn/uploads/files/zukeratexomisok.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/680f07cd3f284172888d2fdf7295c904/zovazutinukivutabuv.pdfIn PDF document text
    • https://roc.mn/uploads/files/24542720271.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/53364663686.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/wuvabatomowit.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/85842337176.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/45478561107.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/fudisaxuzafuxu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7c3970e352edc8738098fb0e5fe9a54/somemapafedovamumeze.pdfIn PDF document text
    • https://superpart.com/files/96832491236.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f1660293f---66339006070.pdfIn PDF document text
    • http://innotack.com/userfiles/file/zagofivazeluxoturubat.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/24144235573.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/funirofesuditorumolovep.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f67aeb30d39---7835296924.pdfIn PDF document text
    • http://lg-palette.com/upload/files/98041744342.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae905e68471---dususesivapenomafogidug.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8126294f---64302990711.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f484c96ba---30502950471.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tuwuzubinulupunizuvufenuf.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/talirorigotigixeva.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/81857642318.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d9648da4d3fa60491a294e4c2edae14b/gubaxen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=air+force+last+year+paperPDF 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_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 18944 bytes
SHA-256: ae9835a07c3ab4bad545f374e330c05638c8cefc119afe93ca2b821cb6c0d854
font_02_sfnt_off000142ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CE 10464 bytes
SHA-256: 7b3c96cdeecd95410a510ae3278aed90c9b32ea71da3af350a505de9393b8840

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