Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a588a0411c55f8…

MALICIOUS

PDF

57.2 KB Created: 2021-06-02 14:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4f63141f568e12aecaccab77c9a71e SHA-1: 1fcc8920fc62344409ce0e891a50d2d5c8cd2bde SHA-256: a3a588a0411c55f8d9ccd2fa47bfbcd44c0cea20c81ab4cdf93cf6d9bef09997
154 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, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160926ab5f28c3---tufinafejekamafur.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607136f99c3bb---41071567161.pdf
    • http://esoftland.com/userfiles/file/38211476608.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1ei3847hkuskrcuu1897iofu68/gowolep.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/aec087d35d9f892ea01b3ce1ed271ec4/tiwag.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135d68db4f---48901264909.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098305a27734---dunupifaneniwirugoxu.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c6a1df681a6bd337197354dee236fd4d/52470088689.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0505a4db6---ligovimokibapapisor.pdf
    • https://detectiveoffice.net/userfiles/file/pawilugomalanakavo.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097d380db301---voveru.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89ef16a874b61e14a30a398f92ee5d16/681488063.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cfe20111---borezuribokawiwijigiw.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/af548db6c6a77096d569ea77df7e766f/kogevibileju.pdf
    • http://albino-pitti.com/pub_img/file/safovewudaxarogexaxewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=voces+en+espa%25C3%25B1ol+para+balabolka
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22c.bin
b482148cebf95d7fa69587cf29e997dc269e523a6c9c2cfc45c7ab7d09636d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 5308 bytes

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