Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd3f6c8fd13584c…

MALICIOUS

PDF

101.7 KB Created: 2021-09-07 07:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6298dcaef8915dbe449538aa39f79da0 SHA-1: bd82ab730f57216111d90837e138b0102862dcf5 SHA-256: ccd3f6c8fd13584c0556d55d8747ec7ea0db616342596ed7a17496c8007f043b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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=ankle+mobility+exercises+pdf PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b6lsvgamjshu12j9sp04va7ki1/17780384978.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/19918913422.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/jutemudufuxaxazudejilom.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xorudimemofolupofasizinox.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/49763247229.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2b64d187cb57a45b53f3dafe1de6787d/pezirometapina.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/db343ebee64faa2e4c02ba5da86ccba9/8368854717.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/tezixaniburasironaxobe.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/sudimoruxobelumarejas.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/20636456419.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wovibisij.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960f6e0cc---8708791875.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/76716287492.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/wuzofawinevuxinafuloxej.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16265327005552.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/26733538164.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d0c994a0---gapamoda.pdfIn PDF document text
    • https://phunhai.net/upload/files/vabifejutupekezezixi.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/76626125198.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/kirujewagoxerovibonu.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/72496688824.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/lilerepozawegubeju.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/rirepaza.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a501f82c3b2---xivudasabibawanimenenati.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107866027a86---44863653033.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b41a74538---xisilasovazidabeba.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_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 11048 bytes
SHA-256: 1017162dd104a51ad7a20d67f940c076e4908730ed3d3fb2328154f6e64177ee
font_01_sfnt_off00013f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 18844 bytes
SHA-256: 15d2a74d85de97b9d509a8ee84117e65d1d623f778992d8782279e7ff800f8d3
font_02_sfnt_off000170df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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