Malicious PDF — malware analysis report

Static analysis result for SHA-256 d907bc9665e8cf8a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 14:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01da4d64e17d85ad2814ab6ba96e6785 SHA-1: e4641cfee447915bb1813ab13f46c5aff2fcc642 SHA-256: d907bc9665e8cf8aa0780f36af58a9c3ab21ae506778325b9a60524df7571bad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=candy+crush+jelly+royal+championship+hacks PDF link annotation
    • https://takarasushimn.com/userfiles/files/21607866155.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/fajejozujubuverito.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/33984012544.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210910102827.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/73283600549.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137403617a44---zefeguzifosipoxew.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/garux.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2940ce526---dowedotukitijofopadosum.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/32480298594.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/zotogiji.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/xidefarafilodateleka.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/pitalisuzuteki.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/pawipevowasewiwinar.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/kudebukunixepa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/18053787083.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/fuwunemaxujitokozimo.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/49979662492.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/b10871f7ec25d486921bcf536ef0c722/pasajevetonil.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/kaxakomebas.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/25425349003.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/jasizivifakuputatafodoz.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/96987830304.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/bivis.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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 17544 bytes
SHA-256: fd04a8092584e8e72094e2ee46488905c8e3a069be5a608479ff9cb47a885fcd
font_01_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 11148 bytes
SHA-256: ac8e650535291025d912270e3bd90d968e864d05441fcdbb323c85ed86463d51