Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fd7d1c540d954d…

MALICIOUS

PDF

80.7 KB Created: 2021-08-27 17:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6de2284062cfde6e25a84d4530b29766 SHA-1: 4daca22ffcbd6ef9ebec0c8656095feaee2a788e SHA-256: c8fd7d1c540d954dc30b20f4257bb90267982108d9b507d8e81157ac600c2730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfd6c9ab6---wulosu.pdf In PDF document text
    • http://arci-mp.fr/admin/File/92788456352.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/21890939783.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/takus.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/gelinumazesojupelukerifat.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/35959121485.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/29361766614.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16f17f720---82931220093.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/72a8e14449b246421e12d9d1e54a3e2d/mafagig.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/zibivonamekukuxifu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/92ee4ff1090dd1d0fa846c2190667401/49929400894.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ebb2036da---bigawawufireraxobebuza.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/nomosuzug.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/53589963689.pdfIn PDF document text
    • https://led7.ru/file/58447442076.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/aa0673fb1efc1a398d3c8316fa23d8c8/tolekuliname.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e05a6b8ff55bf1b180f347cf825b8a44/sasitin.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/87445535636.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/zadumugexitebubewiwepa.pdfIn PDF document text
    • http://tochalco.com/uploads/files/pogivizurovosaf.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b8d3d6f2e---vodojotanu.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/24623165408.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/fe29d101f66b1226bbc43976889bd14c/92951015933.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/fakorazidorimuk.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609934bbd47c3---31463046067.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/mevara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hiit+jump+rope+routinePDF 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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10256 bytes
SHA-256: 0b8a8dd39efc2afea8966227412f0e010574743e11381bc63b09a0ad7a9f3ea0
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 16728 bytes
SHA-256: 616f769fe0ecf4bd31dbaf096f62644f615244fd03228dbc8894b9af25f47cc5
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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