Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb968986c597cd48…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 17:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b7c55c348bf08a3f43f67488f893ba6 SHA-1: 2402050cb03ac8d7d0b2da2e222178c7b86a320c SHA-256: fb968986c597cd4833403c08a92746a8eaef7e44da4f1c8220d81c7cc1625919
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs suggest a spearphishing attachment vector, leading to exploitation on the victim's machine.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://huntic.ru/uplcv?utm_term=grand+theft+auto+iv+gta+like+android PDF link annotation
    • http://sangiorgioautoservizi.com/userfiles/files/30932395312.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c96912c9---tunetemotutupokut.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/7822649160.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/dotavesifape.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/lozifopepen.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/57849763300.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/91321480117.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/deboraw.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/zekikogeroxubibokadej.pdfIn PDF document text
    • http://dkind.net/userData/board/file/zafawoxitadi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398def4bff4---35538657949.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xununapojimovoteduwuni.pdfIn PDF document text
    • http://hengtongblower.com/d/files/73578343796.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210920_151701.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/4358695180.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109010200309934.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mepew.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/91581984856.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/83476271782.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9644e63a---85949126182.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/lobazukatipumevajedap.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/44152094497.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/sedip.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/58031152830.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/tejiv.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/op23avi6d7ub1329vppv2v0iku/ruzokoxiduf.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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 10764 bytes
SHA-256: a6a408836c419482ca8f0d8c3295d1bc2796d01e47e63c543c0a5dbf9855f512
font_01_sfnt_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 14812 bytes
SHA-256: 32b3a6394d05bbd6fc7d47f5a66d4a1352fba825ffcfa1466647f1a1906a52f3