Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ed0ddb495a7599…

MALICIOUS

PDF

91.6 KB Created: 2021-07-14 06:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe9e94ecaa8580e3e7f8379b2d2fc3ae SHA-1: 84a97bd1f7c79d90edb9d2e37207675d618e5e70 SHA-256: 38ed0ddb495a7599e76f9233732ec8919ae4e420ad61cdb35de071e79d5e06a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it is used to host or distribute malicious content. While no scripts were explicitly extracted, the nature of the URLs and the phishing detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4164f354---62454976369.pdf In PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f330a62e03---3323387848.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/63062566743.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/10740967705.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/429ac75fd57ea2a19ce47bf01224f009/dutojakifunana.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81fb0d5b4ab24501f38790f9092388b2/gaxinigege.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4f58835b---wuguwazabajeneseb.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/gebutowulupixiliw.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/nogagipevewazuriwakezomub.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/51bb091a2458fa2e3e0b7421d6045a07/sukajijaletu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/kubodalajibinobepalu.pdfIn PDF document text
    • https://triosms.com/userfiles/file/2380699700.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/93dd7af6c9f3a20e4d4e1387ca846387/jefub.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cca9d2488---29257602482.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e58e7b1601e404f8a79aa87eafbcaab7/literoguxagipivaz.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/35054418687.pdfIn PDF document text
    • https://bnovum.hu/downloads/jajezilazifugamikuli.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6b34d3dc606e754c076a1d0a6c7f02d6/84655453888.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/17e74d9641a66b8864b868c4ea8eb6c2/xemerovulopexo.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/9ad658485b056d37dcec7ceae70086a0/31920554959.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919b9612324---66468718003.pdfIn PDF document text
    • https://actor-conseil.com/files/file/towevaxitosatuzixemapidi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fc13151015f161b0677cfef4f8defc40/32190770169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=generic+structure+of+speechPDF 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_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 16656 bytes
SHA-256: 72808e17caf1f1bc780911f49cd21bb0cdee4358a369cbee473704a46a75c737
font_02_sfnt_off0001477e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477E 10508 bytes
SHA-256: 1df0e3fa50fac199aa7e74f44a699bcdc5815a4c2a0dc0e773a34dccd6505c00

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