Malicious PDF — malware analysis report

Static analysis result for SHA-256 28df1085fae87e6f…

MALICIOUS

PDF

92.4 KB Created: 2021-09-02 00:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86fcda249b5c572eb846328eeff026db SHA-1: b3b7445d90eb3330cff6d6bd5c3b58daae90332a SHA-256: 28df1085fae87e6f824210d55d8bdc924696dfe85cb748794688193fd8ed81a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, which likely serve as landing pages or download sources for further malicious activity. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/uplcv?utm_term=sample+character+reference+letter+for+court+child+custody PDF link annotation
    • http://prmakeup.com/Image/files/kavudiborezut.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bc77a527f8405d7e1500efa182e5671d/55633998497.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/658a7e936a999a6f0d54d7212fbf9767/37696063143.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ed456f9755a5b15646f4409f70df68c8/nonuzemojurowadu.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/waziwatu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785b858a557---17006746882.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/ruxulajarameje.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e2ba32525655399fa153065b9f83a665/73149293541.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/26232280266.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/16993081542.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01525506a---fivorelekomekifebi.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/13351322783.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/wiwosararunasokemujava.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sivubenikig.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/otpcljiuslphva2v13qf6lk4v6/44860052969.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/64974980784.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/61d0af2eedcbf18ff551b4e5de2d79c0/ravasudawogivutapi.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/45643493496.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161028f6b6bf15---tanuwotilon.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kunixafis.pdfIn PDF document text
    • http://centromp.it/userfiles/files/27263580732.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb7081a85---zemadejodedemufokivaz.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/sadosuvajoziliwus.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ed975a31c5a541fb879cce21a0694ca8/jaxatoma.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_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 17000 bytes
SHA-256: c6f7de66af0d73705e9ae033bd8b9441ef7cbbd59270454ba42380ccb3e2649f
font_01_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 11176 bytes
SHA-256: e2c6f06194e5b509ac8b377a4272b9f3b665f40656aefe1d3943a7a79e617347
font_02_sfnt_off00014a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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