Malicious PDF — malware analysis report

Static analysis result for SHA-256 e903f018fb3b5f01…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 19:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f231f0d5094f16166cae19069829f8d7 SHA-1: 23015f2b3c157f9552dd2cffd883141f5de46c26 SHA-256: e903f018fb3b5f01bfe0bf2d253e3cf7cdd9048fe9c5c2dea8976a6b42e5029e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crysiq.ru/uplcv?utm_term=practical+accounting+valix+pdf PDF link annotation
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/14265406401.pdfIn PDF document text
    • https://biocoils.com/img/file/28613984937.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/5977609610.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/batofovinenobofojuwuj.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/57370919639.pdfIn PDF document text
    • https://btegypt.com/file/4005557844.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/45065237226.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/rufego.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/54851353671.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/tofemutibinujepapof.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/xuwogerawiresegisad.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/soliridetirire.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ea215e109---fewen.pdfIn PDF document text
    • https://lazerom.pro/media/file/71070969863.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/66368702482.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbef172666---takukomibeno.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615145e0a3a0a---69389561527.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210901_19670B628BB3640C.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/992b18c0ca35b99c3d06478ec188e96a/mevagagazedelepofil.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pozosusaf.pdfIn PDF document text
    • http://lonsdale.ee/tipikas/uploads/sisupildid/todibepef.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/sirupatafidevevapo.pdfIn PDF document text
    • http://reopen911.info/media/file/tukinetikozez.pdfIn PDF document text
    • http://yejida.com/userfiles/file/juxinukipa.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912020258.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614595742e912---38801086434.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_off0000b56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56C 16132 bytes
SHA-256: 84dc2208d50799643047c5b9efeec04cf60bc4728ccecfc004cabf4040448cab
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10764 bytes
SHA-256: 9e7e1c7cac45782c7bc2e9711e076d69c31a7acd19e300701f1d1771bbb0afb8