Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df5f3d0e3d9f44b…

MALICIOUS

PDF

94.0 KB Created: 2021-09-12 21:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c5ba23adac1dbd7bfb77ce156c8ee05 SHA-1: 2564b65c325fc883a046a49ea90aaf8b961a228a SHA-256: 9df5f3d0e3d9f44bf0eabd833af1c6a86c55455c86cb9cf023d114c7397c8604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=best+website+for+free+android+apps PDF link annotation
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/81512626197.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/jatebito.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/44818541872.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/48107324232.pdfIn PDF document text
    • http://qdjshg.com/files/file/ridogogapawojimubud.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/58538875607.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/lolirowilozuz.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a9523dcaa7e56140d1b8d6156c4ad1a7/35981461445.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/74502466079.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/dixipokuzafoluxafojamolo.pdfIn PDF document text
    • http://newworldss.com/uploads/file/58084962671.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7bhtcobikrn8hdat5sgvfpfm71/11311693168.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/95317063426.pdfIn PDF document text
    • https://svltv.in/userfiles/files/47308900260.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161375412af1fd---2115651271.pdfIn PDF document text
    • http://agama-rc.com/upload/files/8676045343.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fedosagamedowutusexukixi.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/84372439603.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134014ca9904---90907974837.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/xatizo.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/34187166049.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/menazasunutupekusoz.pdfIn PDF document text
    • https://proia.bg/userfiles/file/wukur.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/75131909386.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/munaje.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_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 10724 bytes
SHA-256: 6410a61cc6236a8f786b4f184a92e38145b6398692bfa079f55ad840249636d5
font_02_sfnt_off00013b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4B 17956 bytes
SHA-256: 4fbb41d01e08eadac666d041bcf40ac6bc1cff2d028aa7c43754bdaf2a4dd77d

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