Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35d4ba9b2a1abfb…

MALICIOUS

PDF

87.9 KB Created: 2021-08-13 13:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6fd262a678296bc785f69cd2cd6aabff SHA-1: 08f60cd42d29cffe058e68757ab88ed4fe628682 SHA-256: e35d4ba9b2a1abfbc14f6592811a6e8e6df04fe5b2dce5110f8610a01727f4b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple unknown hosts, and employs a password-protected archive lure, a common tactic to evade security scanning. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://asupuro.com/upload/save_image/files/9171829738.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be076804856---kefoxixegobilomevuf.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/64575259881.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/23542569990.pdfIn PDF document text
    • http://honda-vo.com/upload/file/18627774850.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/pakexujibajulafut.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2822dab4fb---12263196734.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/zobepupagituzun.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/manupumowovoposapinikuja.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/97513516372.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/rulumixebomutagunojav.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/21502429324.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/fukatesoxado.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0e2765ada093dbfcecb2f21d5537b86c/kinibelovexukesawe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6569bdcc9d---kizefeji.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb86e52899---folirix.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3bbc980c2e2fd1b034a74c3ff1e81ed9/12118112081.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5862c5e9f460a71d43bb0b2434769929/73477037056.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841797e5f6b---redovezuxipi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c33622b0407---tesuvu.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/37545020291.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/87773269838.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/8985ca48f48ef5b6205f0ed43241dbc9/34178647135.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/20206755987.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6fc9e20b---79248702495.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/sokoruwifozubaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pasar+de+pdf+a+word+gratis+en+espa%C3%B1olPDF 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_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 10968 bytes
SHA-256: eb79e9a3e2d32489d94c2f1aefb81332e8a0c0f6f9b4fbf7c4ed9db64a782780
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 18108 bytes
SHA-256: 8534d66747dc7b2927f23c58c27cc3f36dccfa57b19fdef10f957efeb9ca81b9