Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ecf11423409a55…

MALICIOUS

PDF

73.5 KB Created: 2021-08-04 10:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80cbc3e510b773544ef6c3ad001e3487 SHA-1: 55f4dd3ff1871cc7be1f3b52cad78a3208a20490 SHA-256: c4ecf11423409a55442ba90ee106835612477f2c3202d70f16e21ab8111ec409
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4abcad15837f90e4b4ee387160e356ee/84440820403.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/rozaxipuvukijijefig.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/vekiripuxefi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a76e9cf8103e9badcd774d4a56727072/52233165291.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/mubofafujupubunu.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/16261060565.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/57979018684.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/levesikojuk.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90c8382aeb---11144476387.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c188d7b024---11614061443.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3fae0c737---19074049980.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kq6hhlfri9fefrgkfcin3cso70/marizaletumibokare.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/jikabonesuvozerapo.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/repebegorafemipo.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/89473566658.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/75601584251.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5dbd7fa2a6c900e3e0d59d9f82236e5c/nelogoworowuxosomozeba.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/tabasajudaroxetus.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892e74c618---6089114408.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ce4b05a73e---786460972.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///jeseji.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/17278666971.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608883b81105a---27387702022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=floral+vector+design+free+cdr+downloadPDF 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_off0000bd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD39 16308 bytes
SHA-256: 4f54a10e580aa886e8fa2abb264a53b8e59671c3f54fffa087a684c4ca45c8d7
font_01_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 10780 bytes
SHA-256: 86b0505f9ec4bb121c5cdf6e33395fe0524093ec8d4d968fa7bbb896e2b177c6
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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