Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0fb4f240819f79…

MALICIOUS

PDF

94.2 KB Created: 2021-08-14 18:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1c659de7b51797fbe80db798d6749ee SHA-1: 717d38ea16114a654908bba370ea3f893dab3817 SHA-256: fc0fb4f240819f79afc353b2e4d9a6c37d0c3abc79f1e49a0c477cafcea5d876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=residential+building+construction+project+report+pdf PDF link annotation
    • http://augustaelectricalwork.com/editorData/file/26301298508.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/lilor.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/i2lu2mbju0g5on4q1jmul1q835/redewugor.pdfIn PDF document text
    • https://istanajp2.com/contents//files/ganifububegorupalimu.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/31769617480.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3061fa83c9---sedimuxopu.pdfIn PDF document text
    • http://llux.vn/uploads/files/towexumo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160983d25a1962---jumibexun.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607721a641555---memegalurisunabaraxax.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d08b9345bd6---95497510816.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/retimejora.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/48832090954.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bbb162a6---wukewupumeza.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/55890599647.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/52505796945.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210521125157.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/lekisomavotam.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/ae6ae431609ce75f901b17b932f9b33c/19236386994.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6cddd4704---bowudopalozejerokeb.pdfIn PDF document text
    • http://scarpatti.com/files/58677569360.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/falezanakutoginek.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d1968181---rudodapoxo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74655994fa---pupuxaluzotigozapetolovap.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7d50f45c---4561448382.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_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 17440 bytes
SHA-256: 69fcfd079380ec800a22997b1f5cf130b55f1abc70de264d8260d5304addfa0a
font_01_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 11212 bytes
SHA-256: c6c2a318cd455f0b420b4ad8a483fd0a9569f26d1945f93d5434bb0003780a7d
font_02_sfnt_off00015147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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