Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe72d77daf7110e6…

MALICIOUS

PDF

84.0 KB Created: 2021-07-09 16:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: debbded119522603a681f87b20e8f6a8 SHA-1: 5cb07d48e620c8d5d3e5d6db9ac73b0bf09c88d6 SHA-256: fe72d77daf7110e6bf731ce0c4635fef78db8640bef5087d26c429eaaab4cedf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, many hosted on compromised WordPress sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm designed to direct users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate initial access, likely via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=anthurium+toxic+to+dogs PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/86e55ccc7955408936bc055dc92c989e/90210384670.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/bevadafujadoxupuki.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/rukaxujijawisew.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a2d87ee3---fupuradoduwetobugoza.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffc4a9896---72256517497.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d755dee67b8---dajegobi.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/bosezipisidiwome.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/bosaletogozanen.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/84786846147.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722f9e11f9---motuxiwakenametumilujoxa.pdfIn PDF document text
    • https://mytopics.it/uploads/file/94944230473.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/17aie632hcuikg1ff0p8dcapti/80215820448.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/7388964875.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ea0dc0cac0038a8d5f8bf04d9cc35836/worujoragori.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/28457758092.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/saxapanadokofeximukevemit.pdfIn PDF document text
    • http://berbun.com/user_img/file/zonumamotedejopanix.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d9ba68f5d47db2146211a3b5e24fedf8/vimevutofemo.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tetemeronoga.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/50532894768.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/acfa5097e76115072c0870a6f3c5fcbe/wokudamifo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9db496ff7---40245321803.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1469655d9f8bab860865aaef7587025/17069900027.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_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 10660 bytes
SHA-256: e236ccb7b68e5e86f62cdfdb34f6968abc34ee4168d3a200da1e11066e717358
font_02_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 16848 bytes
SHA-256: e13e0d2673471da5fe097299d7d23aa31fb21a6f8f62af941bfd674c871df53c

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