Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef2ffb1d4646b97…

MALICIOUS

PDF

128.0 KB Created: 2021-06-22 13:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f051640d1dfb51f9f4a65991f6bf4f54 SHA-1: b07eae51e2f74cd1b0f9dd2f9ae3e4c38dabce99 SHA-256: bef2ffb1d4646b973b5cdcb4c43c41d067224cb74894e0a6886ac9c0473cc3a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dca99635383565c56622197607cdbc38/jovobagatelubigivu.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0790064910427050e7ffb8c8f4df942b/loraleroserevoxonarawamag.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/87320328080.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858b81a901c---fadobozatusi.pdfIn PDF document text
    • http://hydrem.ru/images/file/81835237579.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90e727db0---pagugabaseguvonenexut.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983cddea359---gefovadefudujeguxaleb.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tuzimabuvuvuborume.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55104bc2f---83112255546.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/jerotuvofujokujamoboguva.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ff10b0270b04531f221da9d5be121f9b/4249147789.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78d6d4c2c---57665461000.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ec6111510ba34c5313c9db01a14d4949/60738632493.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8da2c9747ff400ce6810b815963ab10b/91790430682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jvc+kd+s29+owners+manualPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC083 77916 bytes
SHA-256: 8f73e07a0c7e65a9cca14a4e3a5b7eae1d61e444da3bfa932d3e0776437f2af3
font_01_sfnt_off0001a90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A90D 5580 bytes
SHA-256: 161137c160938f6dda63a64a3a92cd2974ee81e2077bf40c197a3a93a5e32fc1
font_02_sfnt_off0001bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC01 9464 bytes
SHA-256: ad3b74029c0110658a81d5fcf66eea5f64681208b2f28b8b3f30edf3741ac298
font_03_sfnt_off0001dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCA7 16220 bytes
SHA-256: 525efa1969ed45ada3a0633ea1ea93af6038d947f26a3acb83cc836ec2ffe7a4

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