Malicious PDF — malware analysis report

Static analysis result for SHA-256 236e312b05bc9963…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 14:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55f4ca5c48832aa89be320bc5eac5729 SHA-1: 1c0c19bdd05a45ec02ba5bdd052faef54666b4cc SHA-256: 236e312b05bc9963f9211c316ad1431c248614e19b9b0c7b46e01d1cc4c4c354
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=blood+groups+pdf+in+telugu PDF link annotation
    • http://almar-bus.pl/userfiles/file/nedupegonadojem.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/valufasisebozozapepadum.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e087596b70---37573770866.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bavovekotitixuteguzod.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160818d5d2cc7b---10272324058.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/91724669597.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/76979025016.pdfIn PDF document text
    • https://austarpharma.com/upload/files/vasozezenewedavobudakuwis.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/90630875226.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/pimuke.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/43948045731.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/74878883462.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/101251ba510274302f102472017ecacd/kitiposonalorizexefez.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kovilarivivotenoporijed.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/32901740433.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/volufovig.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/348b0e3ddbb294592c2c985b94c4fa2e/92025109100.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160864ea2cc4de---31343182103.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3f017f18f---duzupisiv.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/80001178780.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/8894021052.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/kodawusenizo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b72b7afbd---41154446908.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a9bdd01f---fuxasozosupenasibit.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62746430868.pdfIn PDF document text
    • 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_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 10664 bytes
SHA-256: 19bc2b86994d48f741ca67096a634433f27419a558471f44922bef83342898bc
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 15972 bytes
SHA-256: fba78be1988cbee39b821b70b807d7cdd7e2bceaaf0a53babbdbc1512bd283d9