Malicious PDF — malware analysis report

Static analysis result for SHA-256 29363ecc3c0753e2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 00:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee9eabfc3b5824935cbb6e2483de65e6 SHA-1: cc1ea7542546fd5ff16f33980cdcfdcaea9dc89e SHA-256: 29363ecc3c0753e252deb663ed644aad2ac831445d029fcfd322ed61f6a45d20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be compromised or used for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting an attempt to distribute malicious links or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://c2r-auto.com/uploadfiles/file/2021091519430273499.pdf In PDF document text
    • http://nguyenthaotech.com/upload/files/27547923563.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8c3369f75cf0a528df2f77883e0db15f/42589976405.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210902131143124.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gexajitumanukuv.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/nelojofarokekojutene.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/balifapozekuj.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613576001ff58---78248532212.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jixuze.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/28129261609.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/48373943590.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/rupufataluze.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/72244401827.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/buratixugilujuworezaf.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37f86095c---30160791686.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/zurugoparidin.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/94813630444.pdfIn PDF document text
    • http://bushurov.ru/images/files/gepes.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/barapumiwekinofabora.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911195356-3330182927.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/26098104061.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/86255952383.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/warebuzikivimafe.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/dozunanamepobapazer.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vunsq1gec7eegoqpfiddph7o5m/13530111267.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea0cc79ed9---mozifego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=filmora+go+without+watermarkPDF 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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 17256 bytes
SHA-256: a1539f8a178d4071bf062d1ab8e31759a5ca422c4973d3911c62caa81cfee942
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 10540 bytes
SHA-256: 97ba2f7eb653c2811493d1230faa00644d11fa9c544091a814073d0815dd9ff5