Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6d4610dcf1eabf…

MALICIOUS

PDF

171.4 KB Created: 2021-07-02 18:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 37bd4d0cbe057bb713f8db36fbbbb45e SHA-1: 564849014c5988ea42aa3322ef18d388d05aed58 SHA-256: 2a6d4610dcf1eabffd7022d661f018ebbe102de84b7d8518363ad276830581e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting. The embedded URLs, such as http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9afdec11e---vepelonavepez.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf7172485---nexawosarosujadesakeziju.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9afdec11e---vepelonavepez.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824e5b023f4---foxikejinofejeben.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/91209552358.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/82380505745.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb251ee82c---vugodujagamimidax.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q9322ah9lm9phi75kls58ei3s7/75609500216.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/jepuretipubalap.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xaxabujebon.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h0av037b7g0lth5iieqk0t4tb5/sozumixugakijozamuxovab.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/89224e881bdcb2399c67ce25dfbbebcc/45551060669.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/43948990345.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b4979e92---3517528731.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/narazutuvamigotol.pdfIn PDF document text
    • http://soupworld.de/upload/file/92118943633.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0f91a37e92bd31ad32e132df5e45565d/jetenebi.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gaxupowiponenikas.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34092d5cd---72143080768.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-5/20210505202509111697.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc735e77f---nitubatavexekuxub.pdfIn PDF document text
    • http://usateatop.com/_upload/files/7984402047.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/84b26382a9328706a066d2a5b2856c19/24167422414.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073712c66aa0---rezirubatosopigedolodose.pdfIn PDF document text
    • http://innotack.com/userfiles/files/96894490725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pirates+of+the+caribbean+the+curse+of+the+black+pearl+full+movie+download+in+tamilPDF link annotation
    • 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_off00023d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D98 11368 bytes
SHA-256: 8d83c4bbc08db31abd345cb1c6408f2e5f6569c746ae6b0ba3275746362101e7
font_01_sfnt_off00025803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25803 18012 bytes
SHA-256: c89fad5bc9b7d668208204b529cd51a72dbaf38bd3499c2cff069f4f94253df7
font_02_sfnt_off0002871f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2871F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1