Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e00e7f23fa3765…

MALICIOUS

PDF

93.1 KB Created: 2021-07-18 02:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af5c801a60667e003b93a791f170b0a0 SHA-1: b4ad17264bd869c3aefb8033a44d049b10e13235 SHA-256: 77e00e7f23fa3765141e644f48a6aaf6bfe4c66d5c7e76bba856043e0106ecdc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary attack pattern involves directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/191e162dea742c253b791f19fea5e141/kemelaxizolezefi.pdf In PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/28851001512.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb8e6f9cf---71690053888.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f01ed1633e4ca905f2d71b85f2e8fc85/74859813741.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a25736b4b---wemise.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/77504672939.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/13537841446.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/bf0dbc0de086ec205cedbf71ccb8d4d8/wazisalu.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/71811558182.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/65018258837.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/29384131338.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f3e45b4dde5d80723809baf97ccb8c10/besazisitexomolavolu.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/67673287014.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2212224d---41893902124.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b78db87e57---vilotuz.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf277b05f0---gemomidavi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e177d9bb---bonaxago.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6cf27e22---44063726306.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/jutakuwovuzigilo.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/jifiwujiku.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lewesudixedidujekonal.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vosagekeputipowolumu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f243679d56---53361088099.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/wilodizesapodirasidakib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+secret+full+movie+in+englishPDF 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_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16772 bytes
SHA-256: b97986bca648e68ee467889aa2f90c914841c678146f75cc5e10e9e81661fa7b
font_01_sfnt_off00013693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAA 10752 bytes
SHA-256: 252a5ed3edb4a6a10f99991f7e6b058cfa43595c66282c315c068c6ae813f774