Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6367b9b9747665…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 17:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5036622649897a08ad1ddde4e6f5696 SHA-1: 5a57ad8716ea998e75c4490c6faf564a88392472 SHA-256: 3f6367b9b97476658c4f047a377262c428b7efe2dbf865735892ae3555dededf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=the+pirate+bay+list+of+proxies PDF link annotation
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/5686093934.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gevrl97ac61m960fb67hcgavlb/64859108378.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judid.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/xowenidemedineradir.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/niwowebegez.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/28018126371.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zokusunabi.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/42065677818.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/73420389996.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48546499910.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707196fa75---96371550709.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/rupomipofefapiden.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/bururo.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210905023323.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/17965263759.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/61406331707.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/lagupu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/21419996359.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/fikaxuwifusakas.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/kosupobisomofaniwi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1f57667c---senomerobimikiw.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3739a1032---48506435016.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/bixunumujitived.pdfIn PDF document text
    • https://e-room.co/userfiles/file/76769311889.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/vonir.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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16808 bytes
SHA-256: 2c3631de686b46fc890fb454c894ab60fbc3396e005531b5352ba98b0b7e85ae
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10668 bytes
SHA-256: fe1b1ac6e10999bd06dbd51faf3a429537ebe1b1c0b50d5bfe5fab266e421e0b
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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