Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b03ec84d9862673…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 02:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c3341bfe7a07c4270e070b1163bb352 SHA-1: f2f9a09705c2c3583d08f3570006c6c31d6a673f SHA-256: 1b03ec84d9862673f7b4747c5cb5773c973d5153b82dd8f7f219f9e1dcfdb161
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://oniceh.ru/uplcv?utm_term=kunjuvavakkinnallo+song+mp3+download+kuttyweb PDF link annotation
    • https://etadelloro.it/images/file/98469901195.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/ruwozefaz.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/g9aa2p2c7ubs39huiuf7rk1gj3/sivururevozaf.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/66411931647.pdfIn PDF document text
    • http://www.toptehnik.si/images/59608095565.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4b9760736244bd2884f3ccfbd379358f/kurikiludagaseboguxujideb.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/zuvinener.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109052027463249.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/256da5f723b030ea890ec669c4a2b7d2/5529663874.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/76572341603.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1f952229---zuzodukekevosidawato.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8701bf4c3---tesobukutetado.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e592813f28---tamifipedezaneluxipalali.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/42390764142.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/tobaxajujerojasud.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/23380209235.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/65481687317.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133718f49412---wubibukewasavetitotitok.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/reminijukelepifunus.pdfIn PDF document text
    • http://househouse.it/userfiles/files/mobob.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/60183161003.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/72475996263.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f62f20ed08fbea2c28df680bd552523d/35384317261.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/74369957427.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/burej.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_off0000b97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 11524 bytes
SHA-256: 1ab9a116141f632f5ea14e135924e13a7b4b266206abf48e935d3d3aad6e191f
font_02_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 15696 bytes
SHA-256: c9553f35ebd3548c5a9a4e033b07278d463c5ff2fb5d6dac82dcf91f61cd9c2b

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