Malicious PDF — malware analysis report

Static analysis result for SHA-256 7154e5d933f84adb…

MALICIOUS

PDF

90.1 KB Created: 2021-08-11 12:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1b347d7166e5cf9c10e8497e564825a SHA-1: 51f70c9e6a4395ac08ff0f9eca6a5d264a7b1cf4 SHA-256: 7154e5d933f84adb9651420feb670fa0c20df26e99b73d2e016cdfda881fc48d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users into clicking links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8932

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160febf1d875e4---4484668119.pdf In PDF document text
    • https://sealskinz.ru/files/file/7202380541.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/35056780021.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/dirodego.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/lavaruxipug.pdfIn PDF document text
    • http://ruresept.ru/files/file/6954537514.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/dugitabidatuzukowijug.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sagozijun.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf4f4e2c20---67646538496.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/81105405354.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c056611e10a---52680452490.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mebewovoduruf.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/70186528081.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9605e8d5a2---gexilaxaj.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/66370733556.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b43cc1387a96a582fb438463fdfbf6a8/6488816673.pdfIn PDF document text
    • https://digireg.nu/upload/77504572360.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/31543101407.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/77197151945.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/banenakosifu.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/titek.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/798530b2200510d55328f676d2cf5314/5329865004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+hack+tivo+premiere+no+subscriptionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001482f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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