Malicious PDF — malware analysis report

Static analysis result for SHA-256 17860497976c51a8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 18:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 343878a143fc178df773693e51d74df9 SHA-1: 300c7f9802373ce9abb2f6aa9239b1998f5e413a SHA-256: 17860497976c51a8e497266a1d31c96591020ea15eeaae2b48c99d2b71ca6f11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and is structured as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=bar+graphs+worksheets+4th+grade PDF link annotation
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mgiqs58vaap360lumku3l2p7tq/32350826081.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/36149096891.pdfIn PDF document text
    • http://haai.org/upload/file/74157411214.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/45295603130.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a3769f2c50a76bd1639e26d12d56d476/lupakepovisubimoxe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6e2363e361b5730128931e8c88214284/63586846249.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/214adf86dfd6bfec3dc4258bb60c0c58/mosonoripunuzusiped.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/favaxagofagosumi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082da0123616---zeruteb.pdfIn PDF document text
    • https://jetaime-shop.com/files/tixiximis.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/a1e4d4dp535ho9r4phq39l2647/xeliveponamimofanojaletef.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a989315e27e---najikizekerevuwij.pdfIn PDF document text
    • http://metall-press.ru/files/dalisuves.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2af701dec---40239623263.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1c01476bc---joditibogujavi.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/74473263549.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zekupajez.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nanugofubevuzutojorasunav.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68f5a7399---wijarujivetavijumeropoj.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/4932290879.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/27069362908.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/rolomek.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/dupowegojifevifuwi.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/nafufawagipajikek.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1995795cd53ed28829ce67cb64769296/32276891850.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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 10740 bytes
SHA-256: b6daab86f253b32e63f7af98e445d5cef131d2b2027c5a1bc9b194d9f6c9b116
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 17620 bytes
SHA-256: 16c992f4846f23a3af7b81246e7b2523bffeea7f3d9e98de3fc4d6b11e5ac417
font_02_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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