Malicious PDF — malware analysis report

Static analysis result for SHA-256 db863741c4fbfb4d…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 02:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4e3092bad09ff8722ab6bf28963ff89 SHA-1: b3b251c8315081acbb24dab14cef4257976a298a SHA-256: db863741c4fbfb4d078ee192c9807d658aba05efe6d901380706ccd368fe1547
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 CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kaushalacademy.org/ckfinder/userfiles/files/38366159.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/worevulavesawegeboxow.pdf
    • https://superpart.com/files/90358474592.pdf
    • http://mu-rrrc.com/userfiles/file/4462490067.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2686df871---83440207169.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/fdaf3e8380292ce8663b154c99b0ef6a/gemalida.pdf
    • https://ooo-kenk.ru/userfiles/file/56437940404.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1c3gv7ofph3tlq70lun0op99d7/26779910366.pdf
    • https://mamo-tato.ro/userfiles/file/23557217290.pdf
    • http://asijskepotraviny.cz/files/file/sobaxetapad.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b398650e2---misalakawexilas.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/71eedd1533c63d10ab818ebb838b4bb4/vexufeb.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6576bb61d0eb8e5c93a2901cff11c4cd/jusijosalu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63412b70e---dubezusivaxezegorajurefi.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccd9b9bdd---zepegiwibabiz.pdf
    • http://mesterek.net/tmp/gafigomopikeside.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609eaacecda4c---11417375513.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/nopuwiduxerabulujujusuje.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5de044c051c356fbaba4fb103bd59e1/49294275389.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/v6m4n4o3vlctldtvgve514hcq9/suwabawi.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dda9080b1---kugusasu.pdf
    • http://radio6deenero.com/uploaded/files/82400669573.pdf
    • http://northcity.rs/slike/files/besemelawutube.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/56161989861.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5cdbb05d5a3adfe543f120322e0552db/bepexanakotisuvofevoxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=types+of+tension+in+drama
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ea.bin
feb97f971471b79075d9b7cc36904f8f5292ab3aafda6a8f1d4b9c27cb845700
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 17676 bytes
font_01_sfnt_off00012268.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 16792 bytes
font_02_sfnt_off00013a7f.bin
17e9892fe79e09fd5275f0f9625add4072ad7e5aba38417a6ad759f6f9745f9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7F 10692 bytes