Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3918562b2f6a5c…

MALICIOUS

PDF

84.0 KB Created: 2021-07-13 07:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1b7682b0ee2050746f95c9c3ab86069 SHA-1: d28956095a6816034834d438a9c1eb008dbd37ab SHA-256: df3918562b2f6a5c6f2bf101a9d842a6271913b9f1de0ca5587931ddde861212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kopari.hu/files/file/76225841476.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730c3c1ab46---vedizadavapi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5b88dc58---rumexakezetasufi.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/33740102656.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d185deb787---32516359810.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/65049530567.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c558d113e2b---weguladugapigazofuguno.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/85885616070.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/pewavaretakarov.pdfIn PDF document text
    • https://magerp.org/upload/files/76415629296.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608faf86d3843---42684673825.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093d37366868---tafavowafip.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772a746e90---rapijolatesedolamo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1sumdbf4qjct9ov85hgg82as73/fodiliviruwaloluparetogex.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/46238205080.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/70350892686.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/23819568585.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607492677f99b---17640771833.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/fajerojudidinugatux.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dc283777f88---49382202726.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/49099134540.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/watufa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/merik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=questions+and+answers+about+abraham+in+the+biblePDF 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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 16476 bytes
SHA-256: d60b63d5d575be66ac5c25b40a19c7dfa04278779860d597563e6a2fb1ea9c5c
font_02_sfnt_off00012952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 10900 bytes
SHA-256: fcea9952b9e281d5fefbca5e9f54410737a6432b1965ee0df7880989f8bd37dd

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