Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8658bb69d01a541…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 02:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07c66165c426fa1ad7683ed957199cb8 SHA-1: 444e1c6dd487cc729d090cfb24ef8ee7bfb4b013 SHA-256: b8658bb69d01a54195a0e8d221cacfce1ae52744f250848ab23d24e30fc636c7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites. The embedded URLs and the document structure suggest an attempt to disguise malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5cba3fithc28mtv0ij5f19r6rg/89312335997.pdf In PDF document text
    • http://szentdorottyapatika.hu/files/rizivomeligapopav.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6f45d9adae4df4a7688e23c9600ce0bf/kobexuxokirupikapezifosa.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1b405125---joposaruzifef.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/sotikulokaburara.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/sudoligipis.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/50996743323.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86f9ae5c438e15e19043c0ba4f0583bc/sinuv.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16119cb5e0303e---xekuvusogamorizatadasagud.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37d2a2c5ad---bubewizoreseralarolota.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085875147614---32543271454.pdfIn PDF document text
    • http://bjjiffy.com/upload/wepimowosimanawukigexum.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tezaledalekit.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c259ac62bc---fikobikurajaneni.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ba3b0a06---5312685350.pdfIn PDF document text
    • https://lesura.net/userfiles/file/wokusumobakazipikakuwebok.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/tazusutokeniwutosodevaxi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942dda8f38c---wepinepixadi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/80150835201.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/vumuraxiwugew.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wodiga.pdfIn PDF document text
    • http://charivne.info/images/file/64311084724.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab102b191c295091ddd13937330373e4/90616826082.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/63702789268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=highly+qualified+statusPDF 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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 10660 bytes
SHA-256: 22b88ca5b40060942ff91e8efaae9758a554003acbf2578e6d4b7eeb26562516
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 18416 bytes
SHA-256: 7da86b2ae11af18fd1ede8ac74cbc46d18b668a47e0607f81c8b23edd59dce33
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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