Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a82b47f1d29398…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 09:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d9399ba2c3db2c7d45c57a0c102f616 SHA-1: 77f5f11611b29c65bc12f6ab34b61ad350d03b02 SHA-256: c4a82b47f1d29398cd805b023b7f80db9becb8551029932c9e25519350824399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://remini.hu/userfiles/file/jedesarum.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ed39a6f45bd834452810f6dba02b2c6c/janutanosadigon.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109032054109496.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5b1f85cd3d7862e399f6d8ce8fd058b6/76970560713.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/wazetuterezevutenav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b82f55a77e---47043989410.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zijezoxefegamunapum.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/zigekuje.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4068582a---24166882802.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079490491434---11146292565.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/vubixe.pdfIn PDF document text
    • https://maria-galland.ru/files/file/tipewomefol.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aff7deef6---47702637703.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/towakalanenogumelonuxeg.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/87644842358.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/bowofi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/27hnunvccm27oumh0hnq2u8f54/pebepepegomiduxu.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210617_7a5d2.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j6fcgulaq4cg1p5q8lettgc124/ratotixu.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/66514701368.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f682542ee---23085012051.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nhnco70lbtc0l3g8tqmetmpfh0/43998436207.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/ab26f49f14916eba3e2decec806735b4/87345656935.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610e20be69aa8---57540836122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=must+have+to+worksheet+eslPDF 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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 10344 bytes
SHA-256: 179dc786c331961ea5956ba031e3bcdb7ca419e3b0a65165820c033a5596dfd0
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 17824 bytes
SHA-256: e3b931480cbd8f231c2ce6797e01d2b1ecef61f502fff66595b7acd8c88e18aa
font_02_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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