Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb25a4eafd1c05a1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 22:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 432b8dd1173b29bb95c3bb30f8642079 SHA-1: be8c394f0abcb88d0070b3ddd1df1aa73224eb48 SHA-256: cb25a4eafd1c05a1773c5e2ff3f04f4f58d2f9f5707296ef52245d32759dd3af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=cast+chrome+to+chromecast PDF link annotation
    • http://melodylavernebettencourt.com/media/file/77280206909.pdfIn PDF document text
    • https://cooperspick.com/files/rijavuzisaseg.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/93635082908.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/87741855303.pdfIn PDF document text
    • http://www.andreapondika.cz/file/mafewerutarokenalixu.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/xinawadisirovutopoladu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed105da3e3---30002838512.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ce330a09fd13cd97a81503bd16009c43/topumifaxas.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/rezemobetukadisowivife.pdfIn PDF document text
    • http://telektrans.hu/editor_up/satavugigujitetevoturu.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/ridebif.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/3629857068.pdfIn PDF document text
    • http://seger.cz/userfiles/file/puxijunuto.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80434001514.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/52814120897.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109050701092668.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/62335733006.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc064a84c8---57274862456.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/757856444.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/71842961087.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/tulez.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/msn7n6tl8fvdaf23ea47j3o4g0/mitadisogudiparubob.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/79443758407.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/fujilevebitimuxoxerera.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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 18148 bytes
SHA-256: 27fa706f39c647fb66a1db2bbeb08f26febd2aedfd92ccf96e2576858332f482
font_02_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 10284 bytes
SHA-256: 444a84ff8f15b4cdb6de362fca59077d10996b66127880fa38424023971b376f

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