Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb3e045d175b101…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 19:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e80391b850013d501d4fac2cd4feaa46 SHA-1: f7457bf147ad8f760d2e0f40cb775a26e20bc281 SHA-256: 8eb3e045d175b101cdf7c1e56642ac9cd6e6a84a15a760650ca7ac94d3c1a064
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, a common tactic for phishing or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://erulingua.hu/uploads/content_files/files/warorawof.pdf In PDF document text
    • http://samurairamenbar.com/uploads/files/43445596701.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/80157044021.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bl1kc9opunin82f83j5dklo74u/52505339447.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/gasibubenidivebi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fd16a70c6a65688b65a065064e2042c0/81582358269.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090518114073499.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/31134205740.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/mutobap.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/38677779535.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/kapg3j1ragkat2mrl734lnsq3i/57814715410.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xijev.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/mopexuwovijilusa.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/fosedenifinulefedof.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/vekadadolumuloja.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/96087239798.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210908023353.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec75016d7---36129046543.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/65337167599.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/39559671496.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/kifigusaguvazusi.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/11773125803.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f506b461d1---lovuvejarujez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=real+football+2016+java+game+downloadPDF 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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 16464 bytes
SHA-256: 3a0390e3c36b53ad2a06188ecc6e99c4348b37bda8dca51247db25f25bfdb268
font_01_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11264 bytes
SHA-256: e7ad5a09c1db2ec4a1420445fce01029c1addb4adbb13544195916a36d6cf254