Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace7a832ba99cd85…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 14:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b1bd930f5e10e12b9cdbb88f748c374a SHA-1: 12f6bcca1b631b0861fd388494117ad2624c093b SHA-256: ace7a832ba99cd857519980f9212b464c2d76a526b2e79f2d0bcdb9466039cec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pistant.ru/uplcv?utm_term=meaning+of+esq+after+a+name PDF link annotation
    • http://enjoy.sk/editor_uploads/system/files/wakaba.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/zuvefiwavefululu.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/49814694453.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/2761697922.pdfIn PDF document text
    • http://ping-property.com/user_img/files/xiruvax.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/pizisapopibelifi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/e1r7qki31cqejvvn72ctc78mi6/57793879775.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b623b5fbae---77435923212.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/daporufexuxozov.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/fufewexefegifizete.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615251c316271---gutimunetos.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/midiwomurepojeri.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sasafileligov.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/sedeg.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/zuwilam.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/wowuwa.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/saniwefugagazawarovil.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nagexufebisawepu.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/mozaxexalasalewimusoxedi.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/54858539940.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/zipege.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/xadebujenivomorura.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/jemijes.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/58c44284b7aed2e13935cc7d063a3457/menezerazex.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7ca6868e0---22935807340.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/bubapozovorebofalazid.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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 10648 bytes
SHA-256: 20dbfb988d43364e52a51b262387e2719cf1216a714ee73e032992571067fc9b
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 17552 bytes
SHA-256: f30f58d80347d4a0fe23b67ce5357d5d51a5ab28dbb3bf850c0ea159cc2e3dcf
font_02_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1