Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfe141fc462f3cd…

MALICIOUS

PDF

63.7 KB Created: 2021-05-15 12:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b25ceda8e15a2769b7f4a8d9f2ec1c SHA-1: d4e956a9ba322e1832fc8d15840722642ed20997 SHA-256: 2dfe141fc462f3cdcd69bade1f80cab0e90dd1adf66a965737227223af6cc010
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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 http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607decab01d25---3026228858.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8994a5a084ff565a2f1bf4cb1d3226f6/javuzebekolivexer.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/d0q79873hbmosbd9bqd3sqngep/meragepivebapizovitul.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b449a7310---71770239558.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1bd79301---42596823806.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/bef4rnj66f2742md3hu01o8od0/16462519757.pdf
    • http://allasclub.com/campannas/file/72870361184.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d0881625---90110907029.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a4f2cd93---74448733955.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qrehb1n21meft7ueafo800o9j3/xaruxepiripa.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf4d11d201---pumipoduni.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5e72fac3dba5a4b134554894762f961f/xobejagavun.pdf
    • http://accessprecision.com/userfiles/file/16130744575.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2bca7eeafe5c56feefe7270c557b3e66/56348703617.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5198e098---81841700442.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/35d9ac7a441a31d82c16eed5e4ffbda4/sipibol.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8db0cd6cd254077b1a31a164586d34f8/49589659594.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/bbb121fcace7b7071a456392fd1b4cc3/warotegu.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16b5d1c86---tesubi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ikea+catalog+1993+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37f.bin
80e7d417b9e7bae2645b6ca5591b1046e710b6ccf3cbc5dd82a0acd8f780b89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 5420 bytes

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