Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31ef9236c9c198f…

MALICIOUS

PDF

99.0 KB Created: 2021-06-05 11:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d186a1140a6e3850b045dfeb462e2d1a SHA-1: 6d47bfde51a5ec1e83af385bcea3a873dc6bbd55 SHA-256: f31ef9236c9c198fc8c436e500d6d04b6d5e78a78fa7c14ab7bf1e68e72e6293
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=good+morning+love+messages+for+girlfriend+in+english PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ac5185df---nupovazukiladebode.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aa1039f6caf7c8b7f8263336e5e51f47/zogipuzejagukexer.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffc750578---saliwagufunifotefewazep.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/mimelalurenubogunoxak.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/484b5894ccc1f3853873fc59e4e4906d/94866862293.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/80990374034.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/ferezetovopubu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kizasadotumafuwizani.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16083330ca6998---85568687164.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b1d31613---61698181690.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m4q8fn40m92mhsgbhp1tu08ti8/86082574528.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a9d206c4---jujavanevuvubazosisonel.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ea68979c---migupugi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a830d5a794ec11b459bfacc262b48712/xaduj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/347999dd28a019b61b0bea29f9c7f6fd/14960215094.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/sokezolatelotulumajaka.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wevujodilof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14741 5412 bytes
SHA-256: 6ec4bf9ef3ef23e2f5b2014272f7feea002d8fe3d1327924fdc5d7ee67edf8fe
font_01_sfnt_off00015989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15989 10496 bytes
SHA-256: 48d8adf5091d40059cc517684e64e2f7899dacb5b645d4bc9fe7edb0d198333f