Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4bf4a12eef824d…

MALICIOUS

PDF

68.5 KB Created: 2021-06-10 07:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a79329793c7829ef5c1e3cb697deb513 SHA-1: 6c2044c1b9c7d934e9dbef436c8fc5c37a5482f1 SHA-256: 5d4bf4a12eef824d7a714ce86d423a66b96200e62ffb6f164d953a3755661fe7
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body text, though partially corrupted, indicates a lure related to 'llp balance sheet format in excel free download'. The presence of ClamAV detection and ML classifier flagging strongly indicates malicious intent, likely to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8336

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=llp+balance+sheet+format+in+excel+free+download PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/guxolozoli.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f4dee1e52a66e320a3d621cc7b94a797/wirojixamavejexaxuzakaz.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8ebfb73a574c95dc075f5fd6c6dfa09e/88969527971.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kic054nifk3htgcgp64pf3gh9i/guxusoxutetumibaxen.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f54d7893ba1b7459665fd3dfa5735a72/77176103115.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2afe0cd3e0c53e5b8a6f9ae6daf1c7cb/remolitufosepegisun.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/4706161312.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5fkqq89lsjdpjj63arppip79vl/92339167138.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ufr8ineph0p1773onljpscc2ie/luvovinamole.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210607/1754126786.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3bf39e2e---zexikerubavebiduguzidir.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608193b715774---sobegevifapul.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/84745327075.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2ed817ac62cea61b4907fa4376bfa64e/tumalomorolagisajoxujife.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9ac7cf18c---luwefagoralewejononiz.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9ef21271488bf53931ad4a429486fad5/19599452161.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee1e0ab77---22584314735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 5636 bytes
SHA-256: ff500cf5a2e123a6664355ff758e41b57b73b0a9dab1b8b8c42421c63543fbb1

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