Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f4ea5617a19f0b…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 13:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3daa324506abaf299583521ac1584d1 SHA-1: 284dcf13322125bf7dd21b323298e34c2c8c0527 SHA-256: c1f4ea5617a19f0b4fc8ffa35770a6728fb3e6d969eb3189352e582b6738264d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs are likely used to lure victims into clicking on malicious links, potentially leading to credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tubietelbar.hu/uploadfile/buxewopolutakawivewijol.pdf
    • https://ideylia.fr/uploads/file/75850730866.pdf
    • https://karinbentum.nl/uploads/file/26751379231.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b037e598094---devepaveguxavotuxaguzi.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/pogefoduzulemetevoxida.pdf
    • https://kristinanamaste.eu/files/kozawepasar.pdf
    • http://terminsk.by/pics/files/xezevuwu.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/724caeb12da7a57c8211273265dc778f/51421399290.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/70898762149.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/64c0131393233af54ad8551127ee2f71/95989897593.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/58412958.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c1ac6236---77706722819.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b54536ca1---xujojefaxogatuko.pdf
    • http://tanriovermensucat.com/uploads/genel/files/belurimewasinimomipogun.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b25228719f47af83d0e82cb15b4d567b/giwawujunoj.pdf
    • http://gloucesterclassof81.com/clients/23558/File/23073595270.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nqlldebkoaj5r3mdpinrlu3c48/78538247319.pdf
    • http://teplospectr.ru/images/files/vidatexoxota.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e639a531---85456058009.pdf
    • http://greenbrier101.com/userimages/redajo.pdf
    • https://mvpartners.be/images/uploadedimages/file/10481017497.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9de54083---49519948088.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160961beca0ba7---fosedexetuwefupoxug.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9a9b3c0e---15044990753.pdf
    • https://www.abotamiami.com/wp-content/uploads/2017/11/Subpoena-Duces-Tecum-for-Depos
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=notice+of+deposition+by+video+conference
    • 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_off0000f858.bin
497bb1e3b547d82f906e565ac67cc77431e7292f5f714de36d1f7b584e0222cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10700 bytes
font_01_sfnt_off000110d9.bin
48f44b30c4cc1f4639f9251a21383936517151c477c47cbe78d206f2d80f6d08
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 17256 bytes
font_02_sfnt_off00013dfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 16792 bytes