Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d086da2741b671…

MALICIOUS

PDF

54.7 KB Created: 2021-05-09 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb487cd740b604a6ec087c8205e4210 SHA-1: 6e90648d990ebb3c8488d3a53dd3bd7b8b5dc3c7 SHA-256: d5d086da2741b6713bd2251a2d906461429bafea599528e1c671c7b3df7924eb
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073323d2dcfd---pokeperozevida.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1mtu4qocp1j5qkqcidu13a95ob/58019596464.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398a7f191c---vomasirovujobokir.pdf
    • https://planet-for-events.de/userfiles/file/91028084230.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608558606e911---bejexanatizil.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e46f9d6cdd826bb9583114a8c278a6ae/kajunoputajonurupiji.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4c6f93822e3ee31b646e0adacb25eca2/mafuguxajoterawajabamiluw.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d7da997d3bf2ea26042ee11a30ebb2ec/xesegikumogonibabajudiwiw.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/20c5a54ae930ebef2c2e5c205db81b25/21317109769.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dinr42lnqljq6tt5n6apa0q030/powaxuwexexujefoz.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608699ac95357---leperegafakabisosilir.pdf
    • http://meble-tk.pl/userfiles/file/88119021349.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830b5c4a8c---vusowepomaposo.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/95cb0978c9d33b201eb8143fc0dc7a0f/mogazuzepodarawujubozo.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/394690614eab9cace4f8081a296c476e/87344558553.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bounce+dryer+sheets+40+count
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ac.bin
d04f11091354caadf12814c045068b783612290fcfa6f35f51c2d52b465a2e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 5168 bytes

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