Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e786b058339a708…

MALICIOUS

PDF

138.0 KB Created: 2021-08-22 01:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d777c9d041c5431d02119eea30fca79 SHA-1: b9b6f8b61df64222e3c0d52819e18896d18c6ef2 SHA-256: 4e786b058339a708a7f35b4c5e6ffe8cf4e5ebc0472f6e3a751865c796bb2557
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed a link farm containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, indicating an attempt to redirect users to malicious content. The embedded links are the primary indicators of malicious intent, likely serving as lures for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://axwelindia.com/uploads/4576306500.pdf In PDF document text
    • http://etenindex.nl/images/uploads/tozakorofowutif.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/letijutuzagezi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/45167585488.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/voxupizuwukazosodosofuzit.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0560610676---6888638457.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5f6d3b4e159096ec1ee0c0890fcf9db8/73653706383.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607053b4306ff---22629893287.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d4e25aa5---99467950002.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/13420715052.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/29929855455.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/723f5fbd763a8b319670635b48013a41/92675564856.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51c227f28---vovorazarezikam.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/70750795328.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/marejekedefanura.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b85e1eca99719cf5db0c600e05f8ce60/mozuzibidasirasegagixod.pdfIn PDF document text
    • https://ibericadearmerias.com/file/sulet.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/17445407460.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/sofusaniw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dca01908073---pizojoninole.pdfIn PDF document text
    • http://effekt-film.de/files/file/muvigexowepaxefazawoged.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/zawunubofomiruje.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/76583384.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xobekavexem.pdfIn PDF document text
    • https://peterdegendt.be/file/ligepalukulas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=diferencia+comunismo+socialismo+y+capitalismoPDF 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_off0001b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBAE 10856 bytes
SHA-256: cc2e3faa770229df4ff63a277bd0c04d18ee5253551fcaa759e6f185c0dcd42a
font_02_sfnt_off0001e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4CB 19488 bytes
SHA-256: a2744b3f0ef67220908e1c5db5f3f2815a523a19a938b079617bf90d93f60e84