Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40bcfe109926add…

MALICIOUS

PDF

92.9 KB Created: 2021-08-28 18:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce58827e9bfee894b9060185878a22e4 SHA-1: 0fedc7c8113d092ee0faa0feda668bbee3a97705 SHA-256: b40bcfe109926add4f9ec30b13c427bd8efb6caa8cb2808f6440fda9fadb5702
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a lure. It functions as a link farm, directing users to multiple compromised websites that host further malicious content. The presence of numerous links to potentially malicious PDFs hosted on compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bertrandetgastineaudesigners.com/userfiles/file/3885752793.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a9448c5a89fc57ec3f0e5f54685223ff/72810193446.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamuxuvaditolajoxitesupox.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/99151524300.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16111b7d04c7f5---542582960.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f3a5985e7b89a78e62a9fa2d4b74a867/nexewexalawinivane.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/56468237688.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf140284d---punegub.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/93069822052.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/26305809309.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/kumogateromili.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/42104567818.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/fifusudenitogezufujunivaz.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b6b5306b54a0a5946f62604d73463dd1/kivamewexajuxozojifozaliz.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/72898778665.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//39360095613.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/71033287252.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u8j2h3ogiqilvf8bvtel63t6d3/povubojekinazitolefamowu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/fobaxovedivoxes.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0400943d17---safogurakib.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4c28c3d3188b53280e232b79488ecf25/36967290960.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070725a0ecdc---femivigitibiwibu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/93547005496.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926e2247056---59477754850.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/30812736163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=targeted+individuals+chosen+by+godPDF 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_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 11032 bytes
SHA-256: 44ae5a1b663fb37dd1b60769f38190e2679555cfd078a9be6a15669cc36df937
font_01_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B1 18420 bytes
SHA-256: 45b23f2ea629d12f05fa340ede26dfc49e1c8a034b011269b06a78a69dd28b9d