Malicious PDF — malware analysis report

Static analysis result for SHA-256 561c85b9986a8c8b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 06:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f155f1316a0b936775d7a6a560b92ff7 SHA-1: 8e47be8dd4d566c54539a58be56ee109bd601561 SHA-256: 561c85b9986a8c8b2432eeea4510a7b3ed3cba9544c1df80b1077708a0e801a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly indicate an attempt to lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=roams+12th+edition+pdf+download PDF link annotation
    • http://xn--tnqz8hz5cb8l.com/upload/files/39041573922.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wiguto.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161248584d9623---kodotuko.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/72079380770.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/24289734806.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/niretixagojipubeguvuvim.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084237ee3969---44353675939.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073080c577bf---fajina.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/nunozedifipazule.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/joxodokajo.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/54700508673.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ka91pkg8360kkm6bh18379qqs8/18229383363.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f016db9cc5f---47467882406.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/54746786146.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/misefelojifopovusagata.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/sujegekutitovif.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/75956352714.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef478c4236---65260603422.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2v6ljlb9s9g99gv36kj4fn00cg/60443846004.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/22514988819.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73202fe13---zakebigasalulok.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/masesolenexilusa.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/kekebar.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/damopumebo.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/96763205774.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/47427192719.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210608_071242.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_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 10964 bytes
SHA-256: a2ef000e0055c22485b8d5f80bef1199147ff717f9fd5353b4e3475ec7dbe9d3
font_02_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 18660 bytes
SHA-256: 07ab67968fb32b089c81a2f5508fee7a3c16df587d10ac4c3bdeb51a89b80ff2

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