Malicious PDF — malware analysis report

Static analysis result for SHA-256 90634cd4df6a667b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 16:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3537cc760ebfb1ee9f47c64c3ba786d SHA-1: 2d17a06ef575a5f02b8c01f6e0561b802053d297 SHA-256: 90634cd4df6a667bdabf4a42b066f1ed871f44037cbc51d2b6aae3fe35ca5855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://huntic.ru/uplcv?utm_term=cambridge+movers+pdf PDF link annotation
    • https://skvely-kup.cz/files/file/sidugubar.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zupiwape.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/32382340927.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094b88360740---getatarikufeluzawutirokik.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4a2cd555ee4d4232ef2e348a1341e72a/56779250944.pdfIn PDF document text
    • https://businesslife.com/content/files/votofipaburefeja.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/67412060485.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b8f5e9fa---61683915574.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jetewapojej.pdfIn PDF document text
    • http://flomojapan.com/upload/files/dapakifafipafesit.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1622362444950562537.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae7dcec6---xevidafuvanixupude.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/77043324992.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/50969922700.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac66235af---38945460045.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d5f8b13e5---mibot.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161203eb07ad7e---28999683197.pdfIn PDF document text
    • http://seamacros.com/upload/file/gogemojazexud.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/jevirabodutimeluzel.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1f8682d22---71739041184.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/dupesotavivogofexo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/77330245459.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31701700371.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_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 17600 bytes
SHA-256: 631422c095852e32e184b47608f1e9710d2f2fba1843a30248e9826a0d3fb573
font_02_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 10832 bytes
SHA-256: 863d7bfbe1083c483bd0c1346ff61c365b45c4ea4c94075f0a50a6e91b86864a

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