Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc86104a140311b1…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 14:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a9b0155dd2d130c350988f043b94dba SHA-1: 208ad632715fb62c93ab455fd6cf944c14d6686a SHA-256: dc86104a140311b1f254de15908a3321a1b8fab9c0c62486fcb3733c799d7beb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=reichert+tonopen+avia+manual PDF link annotation
    • https://mayxaydunghoangphuc.com/userfiles/files/fikamofirokudo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613054e2a05f0---pateziraboripizefole.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608fedb6cee38---49590120817.pdfIn PDF document text
    • http://dytac.hk/userfiles/jorenolis.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7a9bed1938---kabimuvid.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd61b8aa7b2---zetaxivupovojamaporekiki.pdfIn PDF document text
    • http://iworking.vn/uploads/files/metowatubepikovimag.pdfIn PDF document text
    • http://geose.ru/userfiles/file/worunuvabazezasesaluwuvit.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c7155b3ad7ee8366f2ae6a0843d229bb/tugevubeludulukaziku.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/79623781034.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/202bca9508758fecbaf624331c89198f/vajivitifenosoxefelur.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8b5cfb68---tubesanimepimomuni.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c121c30d218.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/199315138.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/67384834800.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/wilelizonugipezofanigofe.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161078754ec316---24574764864.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e473c4654c---3108500332.pdfIn PDF document text
    • http://ty-int.com/files/files/tavopizumadavugoduwevi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16125145fc8aad---11756118904.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/fc2988e233d6dc5c68c962f9a88c4e62/muzebututekolisifowinizig.pdfIn PDF document text
    • https://actor-conseil.com/files/file/61269688421.pdfIn PDF document text
    • 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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 10680 bytes
SHA-256: 4e0b70f2b8106df69860ff97669e319f54ac27a56b04ee42df9e2f430be6f6a4
font_01_sfnt_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 16960 bytes
SHA-256: 0033d2492018823d49e3ce5a0d90d44202e23823544246b08435bf85398be885

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