Malicious PDF — malware analysis report

Static analysis result for SHA-256 c900e3e8ba321c1f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 00:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b420bd7634a3b8fc9b3cd723c2ada0f5 SHA-1: e09b638618864144e5482801ec81b6d3dae86af3 SHA-256: c900e3e8ba321c1f9e83b9892e2a8fb03929c80c06a76c35acb1fdc8187ee2c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=no+mans+sky+scrapping+ships PDF link annotation
    • https://ajitcoatings.com/uploads/48010010396.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/86036769636.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/ruzivopozixijazaziwaren.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215552652053.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/af2d0a7501ed2e9c709f3321f21b932a/20676516632.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/demoletifu.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/nijunej.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/31800572256.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a985f2d73f3---27459242300.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gkdf2uimn5b6hipgiktot97sv7/44888380333.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/16964959568.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/auiq25kfh2mk9o7vo60kgask6j/33323805049.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/67133119679.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20061061f1---lazuzudosanup.pdfIn PDF document text
    • http://retailcop.ca/files/88051578115.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/tivez.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/t6d5qnt32dgba1ta4g49irbooq/bekek.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c16c20914c6---vufuxaji.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/irvgfij1c41tcnr7v2eh3iskb3/mibilok.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a307b911fda---79154591682.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/lomagagabumopesuxajeruj.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/dujajaselunovi.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/30703325699.pdfIn PDF document text
    • http://belloverde.net/emailer/file/54183233354.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_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 16708 bytes
SHA-256: c5c4dbe4b109145f2bf034c4a406d3b61c0c52e2a0181e7852b774e6eaece138
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10728 bytes
SHA-256: 93dbdde08205330f5d1f5dd4804399f90c76bda5acc984b6a17c13d976a2c5a3

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