Malicious PDF — malware analysis report

Static analysis result for SHA-256 6368365a73b0bc0e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 12:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca5eb5c1d4520c489ab01fc71e0c2778 SHA-1: fb3d7ab5d9ecd0fdea972feddda9b104c7e96617 SHA-256: 6368365a73b0bc0e452c909f67ba1f2fcda3d0cd436bcd33ed7df19a8988ad8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including a compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.ewdel.cz/ckfinder/userfiles/files/rawazukogorinutela.pdf In PDF document text
    • http://workontext.ru/media/file/ributiko.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/20821286531.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/kuxodedilav.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/kekamojekomefavujuzokuj.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/81040013534.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/52254081370.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be37ce2fe---sitipuwekuluwusoza.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dd6aca10bc82f347fdaf2b6fcd6a5461/dutixaruvezubuvuva.pdfIn PDF document text
    • https://rosycaffe.com/file/bavozagazunuzejijuros.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/68175336689.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vukef.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b455b27d6dace578219bd4884b1c7cde/denojozu.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/97899462195.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/figumujazokifu.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/9898968408.pdfIn PDF document text
    • http://zerosquareonline.com/file/jabire.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/soxogiravemuwarutijedes.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/75709120427.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/valunufodipu.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/8543177587.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/19363580367.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/55634668450.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/91711677308.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef08d3a76f---49847898680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2k17+locker+codesPDF 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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 17624 bytes
SHA-256: 1d27ca3dccdb2250914d409de26a5275ada3e53c88f45c4418493cf3cd8db63d
font_02_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 10124 bytes
SHA-256: c5b46dd29d5c977d64009fb20cb7a71682a601b66ce2b2d5707fcf17e125bd52