Malicious PDF — malware analysis report

Static analysis result for SHA-256 879b0a3226d4843d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-29 12:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d41a767616a89805aa33736d0ae3219 SHA-1: 0f84f65c2773d9f022ad7b38be8342599b5298b9 SHA-256: 879b0a3226d4843d056e0a783b12d6c2d3bcb6ac361d356f009cc994305bc8d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of compromised CMS upload links further supports the use of deceptive hosting for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4d71f1e3f85511423d87c287ce6adbe0/xixavozomojotodunixek.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed45c5f2e---lipezewuwuges.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d783fdb2e06---fozoraxotiboxesejotegin.pdf
    • http://skrabl.pl/www/rpbd/fck/file/73238129295.pdf
    • http://msinziniering.com/userfiles/file/jinudamexepukewuwibitaze.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9920dad22---75274217910.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160900e218d018---58282882128.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/802ec583274a9da09dfe822690cb4ea3/10150444802.pdf
    • http://ventilatoryzlin.cz/images/file/76448804998.pdf
    • http://osc-pribor.ru/products_pictures/file/bajusifuwinuxolinorafe.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d6da12571---mikerozelazewaraw.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a399fa565e4---80461900305.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6abaed440b7687079696686aa539d42e/lelorofuluxemojuga.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rogipepaganarap.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qjvbg03ljkbltu7or3nn55vckv/32347010326.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd2ca7531---93385093364.pdf
    • http://www.biotanika.pl/upload/file/51296198194.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3fe5e0fe7---43959218199.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b2c028f84766e39a615e1729f2070793/92656992709.pdf
    • https://equator-maritime.com/userfiles/file/jukajinevuvaguwatow.pdf
    • http://michellesmithscott.com/clients/36670/File/zasevogosolugusav.pdf
    • https://graveyards-fuj.ae/userfiles/files/80261973143.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/68111626055.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bhtjma4pbm73kb909r67mcld81/15368242137.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=descargar+formato+de+hoja+de+vida+en+word+sencilla
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82c.bin
af2fc397ac152bd08835d2ffebb63717892ebee03f574f47cc4dcca189a48847
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 11204 bytes
font_01_sfnt_off00010211.bin
902ca5e3f027b45bb54f3b8f11af6ac78e8095f67c1992f2ffaa75e33b80fd84
pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 16876 bytes
font_02_sfnt_off00012c9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 16792 bytes