Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e64f3f63963a0…

MALICIOUS

PDF

86.6 KB Created: 2021-06-19 20:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1f4c0568aa7a9117d765221e3bebb048 SHA-1: 5f586373d05211b2be50e3f26b6662090a8fe8d7 SHA-256: 4a1e64f3f63963a0c6ee9591c13555a011b98497f685718929ec0809712a2a52
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8926

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aire-limpio.com/img/editor/file/pabubegupefuketikumamobim.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f9e1cac7---nubezoxedidi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vofemilubodobiximosisi.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/24419510460.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/43a50884782df73e0dd8cc45e8f006e4/62368443894.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1tr37pqa1l6blrmp194h44l306/lesafolujasojo.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/zizejubaladilebetudubev.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0a71b0881e0e647d2795f2d8677e6702/kuvafepoxunafomitafutune.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lr0hgaj10jtl0nmlomsplttu2f/87741892978.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/55686943884.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f3599b25---kewakubebakekop.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/5536550071.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d682e827f4ad35cd1ecde4840245b167/30811892930.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f8d2da44d---63778626651.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0eb83f546---mepedus.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/GLLx1DTH0VQ/uplcv?utm_term=photoshop+7.0+tutorial+in+telugu+full+pdfPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 5560 bytes
SHA-256: 0060eb54c8b7b13d54809c6891c28e09eb68c9eca41fd02c34cde1676512918b
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_03_sfnt_off000139a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 10948 bytes
SHA-256: 657d727775efaea2fa8cfeca9717a1bbade6f2a8690df88b5919e26e49e054c4

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