Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b2c725a078f73a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 22:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cad122d6cfac1c7920162af7b550130 SHA-1: 0ff7fcbfac88fc0f02b2aa05aab6c9608e428720 SHA-256: f6b2c725a078f73a0d2cf8bc1296ddb7ce02db248e33f38c506ef0528601b6d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered via spearphishing.

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 https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d47e5fd7d0d23a6eb988f0a67a93d1df/wavarogagober.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/94a0b2bf8f86ceb683c7b4d046d8f0ee/71907803001.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/wugowixo.pdfIn PDF document text
    • http://arslanemlak.com/E/file/moxuvuxuripexosopepe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/80g9vuk7dv5p043j2d905reae7/pevutisudinav.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/roredojapinek.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/tavawowuleragenozo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/pafogivibinidofazedapej.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/82897424614.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/maxigenazamudixovetuki.pdfIn PDF document text
    • http://fullx.net/files/75662429816.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46f18c1a08---pazidijajalu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29a3bc5bf---mekutajoxaxosafolepifus.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f5486a28---pilegaxubojat.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/mujuterazilupuwarabozuz.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58457a6c58---3356913417.pdfIn PDF document text
    • http://eichler-kammerer.de/91826189489.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/66434741360.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/31772778219.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/21142911619.pdfIn PDF document text
    • http://mamam.by/upload/File/file/nafinobezosi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fffc52858---8215025552.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/57369162536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ignition+temperature+of+fuels+pdfPDF 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_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 10892 bytes
SHA-256: 2e5efe31b1bf047e77f3558c6db0c688fc7c23f5ca3155cbe9caf3f955ff947a
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 16576 bytes
SHA-256: 5d043ba4c5a345ee9579dd216b6db3b747b9ac21ba9263fc4275ed017b5fc8c6

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