Malicious PDF — malware analysis report

Static analysis result for SHA-256 269703b1caaaec10…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 23:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cee827bb2692aab093fa04023f21e701 SHA-1: 39b34beb730f8ef1e9f4e4ef32394e86db266c88 SHA-256: 269703b1caaaec10ddb6d3690cc3678ed4a0881f0c4f82ea92ecb692646c82cb
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=how+do+you+remove+an+app+from+an+android+phone PDF link annotation
    • https://amigo-shop.105h.net/upload/files/bezofoxodugazevofebu.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/65725350426.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/37531183350.pdfIn PDF document text
    • https://maria-galland.ru/files/file/90100881024.pdfIn PDF document text
    • http://vlajamo.cz/images/file/80075079800.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/tajedifesorawalus.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/10727064313.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/16154671896.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/renasulukifes.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/10889629582.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/fiwoxajirun.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161442e2abc97a---bumenolipa.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/rotagodeluwutuwuvetu.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905030600.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8ad6bad19c2a13250bb9f7960b26fb16/jozozikoxopuninoku.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/wovokidunozejosumesipe.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/vunomatopadizoximek.pdfIn PDF document text
    • https://grouptm2.com/contents/files/17991180979.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9e65568cde9843ad8d52bb20ab734b82/muvaza.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab5b69f28---fokozuragifosaraxow.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/38119664022.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146460a042d6---kenupixosevutogulekugaw.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090923521273499.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/memosewusafagosenal.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614502076b959---bedodeduji.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xebizuwixusevomabuna.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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 18152 bytes
SHA-256: d3f937d0ddc3c393d73235dd964571b0e23108ec5d491fc735fee91e87fcd80a
font_02_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 10808 bytes
SHA-256: 035000caac756780dd7120c34e6b30014df402cc297fdba0721986cddf9dd653