Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca02cf0f119bd356…

MALICIOUS

PDF

84.1 KB Created: 2021-06-20 14:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 659e0cdf953c519c221681a7447e78f7 SHA-1: 3ba5178e50e8c5c1a2bb1d6f1648c7945f7398d6 SHA-256: ca02cf0f119bd356d4520a3f895c32763139047a686271e022c65e4a4e120046
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/827c37710602945c228822f065534612/1262945105.pdf In PDF document text
    • http://vinmexindia.com/uploads/sokiwobozukemavemo.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/wenunevamoramivaxi.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9e5280a1477fb8fe3b2748237e76d84e/burafakobezibalatux.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/85701105268.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105300456538279.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/fuzove.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/97875757380.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca849d8357---tewuvozolizakirasufeb.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/lepukijaba.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608513d1c2ea3---bigogol.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ab192a4d1d9c239c7750c001c36d02a1/baxunososapabewegodefaje.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibugu765s2u8764087903u36ld/pafajipukuxenoli.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a1ecd617e6e83a050fe76f9c754c8f81/koporasuxo.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/~3/1KS0DP0cxss/uplcv?utm_term=black+knight+and+renegade+raider+account+for+salePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 6564 bytes
SHA-256: 9aa724aab4fa4c5d592435552918aa6d54b1b8ad28defa29e2151b6f0ce5b693
font_01_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 5396 bytes
SHA-256: 84379c6c240880ef1c13ac4c57385bb9745e947ef4f1ddd68e2a3a2b260ccfad
font_02_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 3772 bytes
SHA-256: 95a94ed3621f65c2e6e3e5539c312beadd795c20d0ad429ba991c3fe9735a84c
font_03_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 10920 bytes
SHA-256: 41dde40c0e4e48df0109c5cf8b083c30c83a8b4125afb3cc5e0cfd4dd97ca1c7
font_04_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16148 bytes
SHA-256: 89d88174a6941e29d95412da3dc50f63e5666a45f2fca69c828f67d7ba3b84f3

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