Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14a312545f18270…

MALICIOUS

PDF

122.4 KB Created: 2021-07-28 01:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 900f6d3bfc6387886288e42a83f370e5 SHA-1: eeabadedeb13db8f7b99387f77d5bfac3c7036c1 SHA-256: c14a312545f18270e9e2f68eab14cfc17fb1647d75ff6de0f7b02a6ad1de7efd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest it's used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://techbico.vn/uploads/image/files/dutofagi.pdf In PDF document text
    • http://bycongroup.com/UserFiles/file/dizafusodev.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/3943921385.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ad1c1cf0169969e3f5f6d13f716fda52/nenapibozosetidiriso.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/gukas.pdfIn PDF document text
    • http://www.pvvc.cz/files/22457380613.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49b67d5d0---kavudademi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5840ab5f52---96449451284.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/13747789213.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/89622751183.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439c4ec3b6---74001628188.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/totepeb.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdf064e06---xugajaf.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a077adae09---1744727753.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/jolabuzenuso.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/004d020fc074d9e080cde8dd9d388bdb/pimivupezenufupedusu.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/11745691647.pdfIn PDF document text
    • http://teplospectr.ru/images/files/11067618559.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/80e54be62d42bda741fe75ce8ae7eb94/28762136231.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/q0bm9h9si9npvvc7l4llh7ck9r/268848541.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fc3tn8kqeed46sb326r4q10dle/geraluros.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607765dceff08---keputanaluworamejuzerew.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/wesesiraxatizuwajotaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=preguntas+para+desarrollar+el+pensamiento+critico+en+los+ni%C3%B1osPDF 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_off00017559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17559 11164 bytes
SHA-256: 8bd358fe2ea8b8f0d86fb83b26162b8ff547240ae6c2abbcd69b34a0edcf2d79
font_01_sfnt_off00018ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A708 19040 bytes
SHA-256: 8e1c8a0b5ac1155c493bbfb1ee2b63c387555af257979287f7fcab23ed3580ff

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