Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a4be8373352435…

MALICIOUS

PDF

69.7 KB Created: 2021-09-13 04:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca66eb6dea24c1ee3dc49e520558b1bf SHA-1: 5600a4f2d5c90705e7ce5601ba72644a57bc7851 SHA-256: 26a4be8373352435246b4f34a9e4d27ea34669a993cefdefdd45e0e311d96b42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=android+phone+first+used+date
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/84097992198.pdf
    • https://somogyplusz.hu/files/61025002237.pdf
    • https://hobbes-group.com/upload/files/maxuvadi.pdf
    • https://beyondpins.com/calisma2/files/uploads/95153380422.pdf
    • http://stensoproject.com/userfiles/files/26084559215.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/41706364853.pdf
    • http://tdvvietnam.vn/webroot/img/files/47513363632.pdf
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/36918783087.pdf
    • http://www.gesas.it/media/mailinglist/file/33309375238.pdf
    • https://malmospelmanslag.se/userfiles/file/82311766850.pdf
    • https://davnosti.ru/upload/bonamonerivix.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf656eedc---15611661212.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/dababodirafo.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/108a889da52ee05247ef04d443a754f4/84476882803.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8c1582cf---sawolusanafexosisovi.pdf
    • http://orem.mn/uploads/files/rikotolizoji.pdf
    • https://martabaktelor.com/contents/files/kikulew.pdf
    • https://gestionarival.com/userfiles/file/26201243075.pdf
    • http://thietkewebbacninh.com/webroot/img/files/laganufuvotimizurozuw.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210913/0649204330.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/tolaxizotajizizezimudem.pdf
    • http://wx-bm.cn/upload/ckimg/files/202109070152144634.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613432f3310da---dofodigapotalerisixipas.pdf
    • http://tetraeng.it/userfiles/files/wudoxekevober.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 16792 bytes
font_01_sfnt_off0000cad2.bin
866e0ddd9950852fbc1d1cf63de4674e17e90c898e710c1fc8985999ca5eea7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 10632 bytes
font_02_sfnt_off0000e313.bin
0b989286ee09f2fd59107ff0b62b38da51685d97c91f2b414b70585cadb8c268
pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 15232 bytes