Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff70255bb437e4a…

MALICIOUS

PDF

83.8 KB Created: 2021-08-23 14:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a80941b616be14071371acb8ee082b5 SHA-1: 240816dc5ba118b5389f6d305aee27a4a32c42e7 SHA-256: dff70255bb437e4aa88c93c5bcd62579e9b7f9252bee6b170671a0914d167c0e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098404fbf5f0---zuxorujefowepolasaja.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f9bf9f48abded5b461247417c35828fe/tufonijinedojeweni.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/kobefatagujupukabatenalix.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/17191587459.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/tijirunemejonedurone.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160923212b2f56---2428037550.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160749ea9b1717---78417285270.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/77257517977.pdfIn PDF document text
    • http://asfalon.com/__files/file/vonilegabetogufukerem.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c7605b4c---lotabapezivujit.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/mabulibemorimi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ca9cdbffb29625503b0f0ca54455ae02/zepux.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2dea33990---72061523541.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/43409719660.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/55680400272.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d824371269---61178737654.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3364ca3161dea43b3b0a4e444519fc83/ganigisum.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/lesawuzagakikekimib.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba70f133073---57970677159.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/20725323071.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kepuzog.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa658c74263---dabukuxobexovuwo.pdfIn PDF document text
    • http://unityproductions.com/upload/files/54990079352.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/r208591prs17soplj26ermt5m5/29362184603.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/95667997906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=my+iphone+is+connected+to+wifi+but+no+internetPDF 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_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 17092 bytes
SHA-256: 598db88b5e3237606fcd3a367be6ac0d4e3ba52fb625ae9123ad0a9249d5ed6f
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 10940 bytes
SHA-256: 6537fde4b4d1074ae6e9ad2172ca709cd281fd07ee86553966601b95229bf489