Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ba0523c62ba8c2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 16:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b4ef49b97eeaa0a1da56c1cee5b8617 SHA-1: 63811a3d9539c19b43bc2c420c2690c31cab1f77 SHA-256: d7ba0523c62ba8c26037b9834484e47b08e3d96c62423e49a02e505912d55aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=dead+trigger+game+download+for+android PDF link annotation
    • http://doorsatyrau.com/ckfinder/userfiles/files/bazagosologubixeru.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16133dff169123---15135917287.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/nizutovaruralibeworu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/2953312571.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zafevagenazuzuze.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/77491964361.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/wirotaxolonutebebazani.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/28704864186.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385475acb08---99907664254.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/lazurofitekatuve.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/samolajikafumivozeganidar.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/83911780153.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/89296317282.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/46nlvg6amo7pkfbmps58c6lji4/61426212644.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/sudisetu.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/4418040426.pdfIn PDF document text
    • http://chinalabware.es/d/files/xigorimuzawotukolikog.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109011719167823.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/zulivilutijemevo.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/wuwomaxuverokuvovut.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 17252 bytes
SHA-256: c3691879a482efdd87ff7611e83bc70a8ee807c3b501eacca80a7760b830d5cd
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10616 bytes
SHA-256: a4f30939d066a03a90ef50e8aaade7bf1ebe7e63a4d6f9b82836a0b4f3125771
font_02_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1