Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bba8b51a6fc869…

MALICIOUS

PDF

83.6 KB Created: 2021-08-16 16:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5f43f4045d470ac157d094a2cbb9a5d SHA-1: 5d14c91066f989e740bee022766c1fbad74e9783 SHA-256: d4bba8b51a6fc869f7ee79754bd83dbb9bafede32210c143be83c6deafe1eeff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to host further malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic of using disposable hosting for these links, increasing the difficulty of takedown.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://talleresjpg.es/img/file/vijodenukunamelavi.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0398d9f319---tuxubidesuzukisewage.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/talixejuvisirofexaraguf.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/zorokex.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4fdd2cee---zujaba.pdfIn PDF document text
    • https://rintrans.com/files/79007745191.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/10ccbac9c309d22c4e4be101c15c78c7/legurowoxe.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gpei86dfqq94ephp5r3h9g38h4/rewejimotofaj.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/29136292753.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5d228c8c0---78976180282.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lopedowapuje.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/zisatexeguluxom.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ebjs7us1gkm4muj9a7st6uakup/31358870377.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/04a25a067e5c800e530dd5267da552cc/83176659844.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gd5m35si37f5gf0891nps81duk/josopapakawese.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e6vlibptg72k9eflghhetfh6cb/suwejesuzasufawujuxinan.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1610b46ab5a3b0---62172915018.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/bosir.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/eaf0992ddee46801b0ad19aab671064a/xulogubalosepux.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3faa3f7d640293146712260043d5134f/18862853650.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160862220a2d29---fuvasimirekedipelebis.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908ee3b6215---84847913062.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/89973447075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+do+lifo+and+fifo+meanPDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10344 bytes
SHA-256: b517bd0fa98ce9ca883dc78922657a5831c2e1857dd162476b5141ea350e86ea
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 16892 bytes
SHA-256: b8a2ce0969f693fa068479679805342c0a6adcaca83412b9f98424cab2f62251
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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