Malicious PDF — malware analysis report

Static analysis result for SHA-256 3416de8f133b8c08…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 22:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af72dab2f8fe532fc0c48462500287a3 SHA-1: ed6f9c3a1acb738f8704826704a1ee1e63c9daa8 SHA-256: 3416de8f133b8c08b17e87040fd7b174ce27b9cad0b507b0c352acbe1a45d15f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kwartetproforma.com/userfiles/file/sixakemiwirav.pdf In PDF document text
    • https://baohohoanglong.com/userfiles/file/polefevisuvusonesixozaw.pdfIn PDF document text
    • http://odumakus.com/uploads/files/89595582387.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f49d0deff---53994912598.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a88fe8c8b---68917247505.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/32884663711.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7mi17a3trjr57bf36d78pnvfvf/sujagijuki.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/96987997050.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/5089399393.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/46704871026.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/guziboxefagaforokuzuwite.pdfIn PDF document text
    • http://domplus.su/userfiles/files/xifijagikabumi.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/76114054036.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/10784284054.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/jagivijir.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/xesudubof.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/pomofesopujas.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/2103225796.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/tavokesasepo.pdfIn PDF document text
    • https://sanagustin.cl/files/75101519543.pdfIn PDF document text
    • http://aweibel.com/Photo/file/soxefusorax.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/63772053869.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2p03qbieqoj1g5g872pa2j9337/22487714952.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8c376f2af012f3a2772c1a34e81d7fd6/33082321599.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/pulevut.pdfIn PDF document text
    • http://esen.life/userfiles/file/sabumitizinekodawakojajep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+record+bluetooth+audioPDF 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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 10520 bytes
SHA-256: fe454b12a23c70989fdcc550a8369d2a6c5a9fd8a76082df58a995197710f362
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 17932 bytes
SHA-256: 2ee99d330ee750542813b6431b1b6d6c8636236c947456e1620c64083d1e1708
font_02_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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