Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cb97a076ff1694…

MALICIOUS

PDF

76.9 KB Created: 2021-07-01 19:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7cf98872ba39178c1699bc452efb209b SHA-1: dfcf8f807b215a530383a8d1c15495876a4a6486 SHA-256: 31cb97a076ff1694c6153ebe898e28bbe6c79832c94f85ce390ce431b6f2807f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and Trojan activity. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://infrive.ru/uplcv?utm_term=kent%27s+comparative+repertory+of+the+homoeopathic+materia+medica+pdf PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9659d9658c---50395781798.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf2768141d---gonat.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vfc3b25s6g9ffrkbp8bn8ektq7/86223584265.pdfIn PDF document text
    • http://cortabellanews.com/userimages/21722307932.pdfIn PDF document text
    • http://falerisztika.hu/tmp/vixes.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/eb3ee2efc39b3c702ae8943025bef7f0/gebifodiwuzi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092cda619bb3---mixoxajitufutuwolof.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/kufapizurezuge.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/2853597618.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/9278837337.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/97ho85kldfvsnqp7hm2a2u072a/dokidizeriziju.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b73f0773---71961829021.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/pagikenaravajojad.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/39820888284.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3072a6f77817b489e842787a420674c5/52310632167.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/kinimotikajo.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/92729467827.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210515123435.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f4233264---49511190225.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/8ef8bf6aef212fa7b837bfef86bd7a86/37556612726.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8957b7c783---95445746886.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/55663879287.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/suloriwopa.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/55ebf79fdbf0cb2dec973c328573a099/36518757363.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/765b9fda2cd167f1fd4adb7625a83c3e/lazadupirej.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_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16032 bytes
SHA-256: 6d2b95ee29d12bd3cc3e8c21d94cae16362f69e51e5118a72403dca80f4214b6
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 11044 bytes
SHA-256: 7e4b284bf4dc6de262fd864f99b7d86d473cd038ea085ceb28cfad6e4a9e3f40
font_02_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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