Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdc378979b0a78e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-02 17:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d185c045d0e7306fe98e9123a75c6aea SHA-1: 8ad2ac3c2a78405c0f40673f30d71cfb92499eef SHA-256: 3fdc378979b0a78e57869d92b08c567a75b7430a5c00fc919f91f23deec036b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8854

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://box8websites.com/ckfinder/userfiles/files/tewodazolatateboraz.pdf In PDF document text
    • http://ck-tct.ru/userfiles/file/82796985327.pdfIn PDF document text
    • http://salt17.com/userfiles/files/4398313479.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/lomix.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/1935872531.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/lolapuvikaruxanejiz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fbc0fdf1---gamatamitojevumetinizame.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/64066577143.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c9ab90fe6fbba0760ecd20db14ae1905/79152722403.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/59314061367.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/rapixuzapewumuwu.pdfIn PDF document text
    • http://ranch.pl/files/file/mimobebujaniduvo.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/tobizogasome.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f1e18599---bedifadezosokabimop.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021061803223673499.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/felilirodakurerezibunab.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xurirovid.pdfIn PDF document text
    • https://bhalakusari.com/uploaded/ckeditors/files/lezarugevokokuzidabik.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4555c0b2c3434dc6564d2e59acbe6f4c/dototukadutigaxonipuvufex.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/71186928080.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/takowarokoxepa.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/83167424342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=como+converter+pdf+em+ppt+gratisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 17376 bytes
SHA-256: 4129b6300165bb6f5469d1b17b17b5394ec2910a21dd20906430653fba5e9d1f

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