Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f75889ea394053a…

MALICIOUS

PDF

92.0 KB Created: 2021-08-06 10:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61fa0bfd67a8d59efb645e058beb063f SHA-1: 225bf6dd2d519776c9e24991132cca52ada31682 SHA-256: 5f75889ea394053ac3e7c66f3de70380b26916fde97262e20ae9fa7845a872be
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security and deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=sumas+de+3+digitos+para+ni%C3%B1os
    • https://marcuspietrek.de/MARCUS/files/file/fololisitibul.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/78335043433.pdf
    • http://www.tramag.pl/upload/file/49167006721.pdf
    • http://phrabat.net/UserFiles/File/bemaxitituke.pdf
    • http://aarogyamedico.com/userfiles/file/4559204912.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d18f0a5d1453149a2ad3bd287678768/vevotabat.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/95eadb2f6fda8866a8623115ae509f8f/vofuropofojirafezufit.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097c48f1ee8b---48904536267.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1c0923f14---68637048496.pdf
    • http://prosquash.by/data/morabuladuv.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1db29fb98---pomadikokeb.pdf
    • http://modamoda.nl/uploads/pic_lib/file/11141455708.pdf
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/73590911581.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/67072992662.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d8bb687305f1458c14cf5f9d8b28c150/62545917986.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db61f25f9---89305605828.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e188680a914---lenamuworizifixatabulokag.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95fd1bb5e9b4f8a86f172467f2e6c0d5/vamidulig.pdf
    • http://poltinik.ru/userfiles/file/89229129539.pdf
    • http://tdvvietnam.vn/webroot/img/files/jululafifikorida.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/47191347763.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c339d5a191c---rojolodakubeboginoza.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a7b369a6e8910ae5413fb5541a589868/kimaxabogusugejomizowofav.pdf
    • http://terminsk.by/pics/files/66547956263.pdf
    • https://hosvagyok.hu/userfiles/file/vonejajijejiw.pdf
    • 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_off0000fcfa.bin
bd350656cebbd4bcb11ae13c322b867ba319250077570e0ad5331e165ee1ee44
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 11244 bytes
font_01_sfnt_off000116d9.bin
efc68419619d3fe7874a44584dfc16afe49a39cfae20c9f1a22280b3bc745d53
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 18844 bytes
font_02_sfnt_off000147f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F2 16792 bytes