Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d939dabbbaa6cb1…

MALICIOUS

PDF

83.9 KB Created: 2021-07-19 13:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab32376a2064e70b9571beb53c03c671 SHA-1: 5b69cdb4d9a3167477f744bc6f1cb0a6cf71c03e SHA-256: 2d939dabbbaa6cb1a22d97a262f9543d78eeb9bf9a2114a33039ccc5520d2665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting. These links are likely intended to redirect the user to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://clickkedai.com/userfiles/file/5904495586.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6aef0617---47079140296.pdfIn PDF document text
    • https://langumeistras.lt/i/File/92477628887.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/84064182948.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/14985537328.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/finemilijivovi.pdfIn PDF document text
    • https://diphong.com/uploads/wosavipo.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/61712478148.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bb1b1c88---xekalokepinaz.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8fe04d09a4b11bea6c6abdff4e6ebe64/lufixokelek.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/dafufufadomutasa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85a38a851---74860543276.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zijagi.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/20943892585.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/22000393335.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/meperokiwolimujozijawu.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/dugexugenefizitinova.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f10ed9e3ed---75620842191.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7fvmhbaq1d0orfe9d3e82m378/kinur.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/kijufo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/85f3bc424369047b66c70c970b52fe26/zazifurawazufu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3feb3ad655ef55d6f348da9ed023c971/nagapekibejale.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/30fcbbb86a2f45edba45b9ae69a785af/novuzosugidepijuxoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bring+that+up+meaningPDF 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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 16412 bytes
SHA-256: 472b4963b1735a46a2aefac40bf18ba833fd436f6790c7527de0e002351c6547
font_02_sfnt_off00012b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B08 10520 bytes
SHA-256: fb900881584f085c3127bb549fc3f42b6b957c5268dd8f1dfdcd30ae398bd32f

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