Malicious PDF — malware analysis report

Static analysis result for SHA-256 414338e01674d584…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 20:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe16a3c1811d0ecdec15b99111801898 SHA-1: 4c93686901c7574b1e4e9ff15652035064d47f32 SHA-256: 414338e01674d58468d3c6112ed4b552e415a972426adab0c984f27176bfbf88
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic further supports the lure of downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3162dc691f9102e7f66eddd31339088a/20280178571.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/lenapoj.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f50198835ff---4337161704.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f5a20b24---terin.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/vodimijefozezinasagitu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/xuvuvexikopipozuwumo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33751d8d2a---95514129131.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ritelafolaremodigobewek.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/onemkhs99edo953p2dtpq9e7c3/53956812957.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b140842bef---93344671382.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/ravugiwepobufidalujil.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba51cfd79---69633657005.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f787385aa677e2e882d3f779a005dbff/15574917113.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/fawirupomup.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/43506780770.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/komopodijixil.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kusaburatofusoxatipuz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99849124737.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/romopexilabajawaretunab.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xutinigexivodof.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/gepumosa.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/rupumunatexilujunenekuloz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53aada1529---lepotopofutaritube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+gadget+vcom+driver+windows+7+64+bit+downloadPDF 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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 17116 bytes
SHA-256: bc8ca87fda06af75a06796929d4dcbac281a3424eecb937f15ce63668105d285
font_02_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 11284 bytes
SHA-256: 1bddcb5d12e83a51f000679263b586cd7b6ddb41fa1db918b8ce51e9697a9d5e