Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f4369fd05889b5…

MALICIOUS

PDF

94.8 KB Created: 2021-08-05 23:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b54c3b251dddf4f1180b775c9ce4c9ad SHA-1: 3255c9d12942e974d525cb282c1787fe5fd786b3 SHA-256: d2f4369fd05889b50cdfde770a43650d443b972e32c859dd036cf1c7437659ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=audio+beats+pro+apk+rexdl', are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wastran.ru/uplcv?utm_term=audio+beats+pro+apk+rexdl
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607923f144fa9---wowugipudoji.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/64f9a3e344adc616d22136bf68b35b33/17362738230.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hr08k4akqqkslh162m71fn6n5/gogewedemutazetipu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75a5b8744---zusafujal.pdf
    • https://fo-prefectures.com/pages/files/juroxunavejegotusaramomi.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1dc1b8bc7575f612fa5f27ed884bd26f/40102437147.pdf
    • https://lmbri.com/WYSIWYGImage/file/gifonexugiwejaveno.pdf
    • http://seoulsquare.com/userfiles/file/tagurusinerupiwapo.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/969dhknk7n4b8u8g9edd7k9ccu/rojilidadolovidujowe.pdf
    • https://locoffice.ru/userfiles/file/14804822575.pdf
    • http://ipublicity.cz/data/file/mesuresigijiwudoxipe.pdf
    • http://abwninemile.com/uploads/files/zepimeg.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/11s2b1njul1p4j756lghi8ci03/wetewiziw.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e0bf0237a84eb787a9db040adc145873/xitubudebaju.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/91916198932.pdf
    • https://decoveinvestment.com/userfiles/file/sigiravuvetoguluvobupum.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/rafaxudasab.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/73054380251.pdf
    • https://travelstore.tn/userfiles/file/mibibij.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca450a1ff9---xozopifabeja.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16792 bytes
font_01_sfnt_off0001061f.bin
d89e982e6a6f0988f373303547ae8434a4159597ee7f00a3547b0e0f27aef3f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 10696 bytes
font_02_sfnt_off00011e9b.bin
d4895b213652f29c9dafef1dce6997a534364937094c8e45340e2d3ff7b76cfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 1788 bytes
font_03_sfnt_off00012702.bin
598e2bd95bb6b796c4bd06d7a90d7ab62f36536b00d764feb1e1c778bb9a7f4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 17648 bytes
font_04_sfnt_off00015548.bin
581622da024f72f1a1622521f1e85b2573310ff7bf6afdaa03edac66de1641ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x15548 16616 bytes