Malicious PDF — malware analysis report

Static analysis result for SHA-256 589ba93ae8892385…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 21:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d177456000fe7aa64a79962eb0ac65c SHA-1: a9b88631abbf04b731fd7e0c83aac75950fbeca8 SHA-256: 589ba93ae8892385432a67f86b515a768383cd66361a4ac5d08b2bb209b5d79e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://huntic.ru/uplcv?utm_term=marriage+biodata+format+pdf+bd PDF link annotation
    • http://chinatriage.com/ckfinder/userfiles/files/kusok.pdfIn PDF document text
    • http://ippon.lv/uploads/File/39384734501.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609857b2c030a---bakutipofezivinalefujaku.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/62934921838.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/65051357644.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/wokexugiduviwuzofasafud.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/28474457997.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/4197bc6f37bc570c0fb687582f4f174c/79858855726.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b5520117f---89967264605.pdfIn PDF document text
    • https://seerupit.dk/assens/file/wagibanuveseta.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/netovipavisiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe91a35798f---nikoj.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/95417229431.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/25835083417.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3ae3b04c---90361449391.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210818013155.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/56769051162.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d91c82513---75712131651.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/vubivovuxal.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/rodaf.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/68e0992a3d4e5fb216f8e0f1c73f1646/57556679675.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_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 10656 bytes
SHA-256: 71cc35e5e5050d6a8bdebed8c2329044edbc64b8a80a9be937ec6f9d45fec951
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 19636 bytes
SHA-256: 864c0874a79500003ce6fddae66edcbe6e20549fe49cc47c943d38c2f9d99f78