Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa9732e470aaad6…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 02:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d00f3fbac2e45b4b37d7d4a2d5e17dd SHA-1: 21f2a0801f83c47c291d829a4915dd0070a3cd50 SHA-256: afa9732e470aaad6ed7cc84983e76fdd02fa729c72953cd3c7e08b6cb641efbe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content. The presence of multiple PDF link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bruceleevideos.org/images/file/debokixozedivenijid.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d3a695f60413974c259fc77a85c30150/romujojuzafopazakev.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/xirevuxabasirujinoketijil.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a60a79ab3c4---61489233261.pdf
    • http://davidhammerstein.org/userfiles/file/83551658434.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6aee0b7a---vezorulikobirekuviruwegov.pdf
    • https://aashianarealty.com/file/fubiguxela.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3209c2aabd975e75e162c70b0de85f0b/kudadajifi.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/47d31b57956251a45ce40f840aa9ff2c/3859433992.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/353458c737adbf53b8a1759616564c58/zakuturezimokiboxipaf.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16080839a3b6aa---vukiridibaloniwejufe.pdf
    • http://htwy.com/upload/file/50637554188.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf960969c7b---matovewifuletononixuwufiv.pdf
    • https://aimara-bg.com/userfiles/file/mizulofanutugavisasudukij.pdf
    • http://sanga.asia/userData/board/file/55405085384.pdf
    • https://prawobrzeze.info/userfiles/file/zuzalejikafezazafegum.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/anlhpl903208ru8b6ekbe4qu42/75572753874.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3305818125---67588670692.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9829ab89d4cc5701fbb77d8edf7eca8a/14412583034.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/93969379f4482a681ea312e282a6533b/sedukiwunudusibes.pdf
    • http://lapawan15.com/shop/fck_file/file/9725038133.pdf
    • https://kingdomofgodmn.org/userfiles/files/zetapenapotasora.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fdaad3318---dunidegumuwutudarev.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f51d7c5c---35006027129.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=grr+to+rsw+nonstop
    • 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_off0000e248.bin
5d923041f4bfb1aba94c8653d473a0135661c64116766ba20a09db813ef27452
pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 9940 bytes
font_01_sfnt_off0000f878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16792 bytes
font_02_sfnt_off0001108a.bin
eb338fff5b91e0baaf07553339aef43486c32a30515210f5021dec70803f98af
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 17016 bytes