Malicious PDF — malware analysis report

Static analysis result for SHA-256 807e96d057d02fca…

MALICIOUS

PDF

94.0 KB Created: 2021-09-22 13:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c85f63bc511077e5e55265a32f5a4caf SHA-1: 0998833c2fbc70cbad6ae3d6a8a083c24ac11983 SHA-256: 807e96d057d02fcabc670205d875ac1388c55f876839204ab3469cc3bea1baa5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vr-spagna-20.effievirtual.com/galeria/files/xefirakigobolekisolet.pdf In PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/63193590602.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/24138029278.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/geson.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7e31e4e3---97433477726.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/sajugarifilutepeloluwabis.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/fexukodewal.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b1caa7dd52544f7205de5f9fcc654a9a/80364244279.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/kugujapawor.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/mofapapodadu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d5bffe5---kibafoja.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/51427004430.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/64855965082.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jj1p692haa03rb9v0h7ruq5v73/95597568086.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/meteketaruzuxitebuxag.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/20422205329.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/xuzivamikulidoderumuna.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/fakokisarekoxuwulojutone.pdfIn PDF document text
    • http://klaaswester.nl/img/file/rolon.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/dufewopiso.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/vufaxe.pdfIn PDF document text
    • http://poliinc.com/upload/files/17402117021.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/wiwufopo.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/xexagowupuwipejonobosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=123+movies+dont+breathePDF 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_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 10920 bytes
SHA-256: d0e981e131c69625e01f6ff33d23aa5f73d1ca050ddc505064fa959df18f3a00
font_02_sfnt_off000136a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 19652 bytes
SHA-256: 480e7b21213a47b843390163848ed3d0b8d64c6276df532478c08912309c7a8d