Malicious PDF — malware analysis report

Static analysis result for SHA-256 537c05969a800dbc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 01:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c3e07801385dc3b13a8979a26ecb3955 SHA-1: 39f937961b1a677d93718f579f79914e2f01c5bb SHA-256: 537c05969a800dbc93854e5e7a48b92e996997f546be41964543d99e6e887a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://infrive.ru/uplcv?utm_term=political+cartoon+practice+worksheet+answers PDF link annotation
    • http://nasfthr.com/userfiles/file/gomamamuwemas.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cca2a646a8e---31349973028.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/22559506777.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/vudinupegozibetasekaz.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/welaxegepurarebafore.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/fadifupewinebe.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/fesesu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b919db4a1ae---moxulasowiteb.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/15vch4bp06ui8p25q0hq4fjknc/worizapibipobazetamale.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/cebb2d83c9afa840d1708731e9c0de78/63099362820.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dsm6iovia5olna7rvqe5g6tnro/kubepabe.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/puborobaz.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/gaxipimolusiforubimerite.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c869e60c8604b0993501d442d0f5907d/20618002376.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ijfr548qjrfoat19170u81gsq0/tipijujixon.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/98855890498.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160910fdef059e---voxuninogubozanaxewife.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/59356542967.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611515a11ae11---59962710682.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/16623517dd8054d7ac31412f6d355704/gozesulovetupu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fonagomigipogakivovabisa.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7417818d---4844084753.pdfIn PDF document text
    • http://asfalon.com/__files/file/galunewasa.pdfIn PDF document text
    • http://skolky.info/foto/images/file/vetuwazurajemamevuxajimuk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76E 14828 bytes
SHA-256: e7c127bca4d7d228f834dde14d5aa16bfdde492bea628aa7d050a981f0038e20
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 10648 bytes
SHA-256: 6f22c0ac944995ea1a9343e7da00e35b3ad1de5da2be4364f8e27213db25758a
font_02_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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