Malicious PDF — malware analysis report

Static analysis result for SHA-256 2800de0fbbaf9edc…

MALICIOUS

PDF

76.2 KB Created: 2021-08-03 12:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0605eaa0ea5928e9f0e4202a36ea684d SHA-1: 61e29da4b741f4cd159ea6663d90ef0eb48924ed SHA-256: 2800de0fbbaf9edc8c3bcafb8fc8708a03554c94255252d637f1e0eb24768f4d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the numerous embedded URLs suggest the primary attack vector is directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d0irshhpf5qdqg2cg57e432e52/fekagiw.pdf In PDF document text
    • http://www.toptehnik.si/images/8664296891.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jorogikutavatapem.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160712f8c4c2f8---ruvomasaxuposezesazupobe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cc6e2012d---60669869498.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xalerej.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/puxetedivurafubomasawow.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/futavorilepasupe.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mepojagevuwo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2t4n54e4vnveig10st6t71df21/27264191372.pdfIn PDF document text
    • http://chapelguild.com/images/usr/masiduxerewafogusevij.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/39872210396.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/67361902248.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/sumejovajafefepumem.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e24a690e23641829146fc94496364670/vajobelatetikeb.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160804cefd2494---gamunuzawoso.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/96287661021.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8a593226e---lufujufowodivaxufawujo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67e2aee8e---12973564043.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/86799977852.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lakuvojiwodikafi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c4786d3476---24574408374.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/48de526775d8ffbdbe9832be9ad91bab/vopif.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9ec56793f19e539f48e6eb99de1feac0/42714947241.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d298264c453---3437441921.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5m6hvaf2ppbmoaqqh0nppm039s/47063984771.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/80600697548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+calculate+volume+of+trapezoidal+tankPDF 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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 16156 bytes
SHA-256: 62690eefe9f5b8c58b70583e0915e148f9546da123aa43b1eef23a29f0a42670
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 11008 bytes
SHA-256: bd72cae1d48737333b5c1c7a789ff341489f989d5f330b2fb073f9434f586125

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