Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c58d2edf45af37…

MALICIOUS

PDF

88.9 KB Created: 2021-07-06 10:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: af72e522d2470c8584333f32ed480680 SHA-1: 25b6d29e15c08c6dc723426c111e958dd2d0e2f6 SHA-256: 17c58d2edf45af371645882c0c27acda49876e56faf1e6f3b8f5e2e35bef7b5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the heuristic findings strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/064861c28d92d01763a9934fa1a8386d/30682924977.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d7296036---89969883906.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/povawelizimetogiwon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70079ac43d---81613789081.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/fedowexuwo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609df968603c2---mitogumitim.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba765b7b40---77776245040.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/3519740903.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/65037118272.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ffc27e89671307ec28e6e39d4391604e/26595850405.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5654e4ecd---1047066535.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5l56p2jj6hf5npro9a39rj6er5/minesewexuti.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tuwinaxogiz.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/mesogiruxudivilavaxi.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/nejidebulazumanajagonarig.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/3039494989.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1550ff1a---daxalexumitazibin.pdfIn PDF document text
    • http://altinay-law.com/images/file/11310188785.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5044e7934a05491d840bb31221b9363f/belekojuwafedeluj.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4076490ea---nokeneb.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6debafc85---54410498710.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c972ca22---37828700068.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/93501722267.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9a5f335293d4cdfd307b6e2175005e07/58376938734.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2af98796af333af4f1fc25bb6d571911/sanazem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ecg+changes+in+lateral+wall+miPDF 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_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 18716 bytes
SHA-256: ed1c7a22db2060677114e4819630a0532c18689a5162c95a9eeeb4ef48284ba4
font_01_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 10628 bytes
SHA-256: d4e8eca872f53e131ca30e1a0dec557c752c9a263e3ba0691a393fbd3ad5e98f
font_02_sfnt_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1