Malicious PDF — malware analysis report

Static analysis result for SHA-256 e233b993bf30059a…

MALICIOUS

PDF

86.4 KB Created: 2021-08-19 10:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9ac547ca811a1a4f4e35ac8678138793 SHA-1: fff632c6fd11315a490b042d69f1d1c9a97e1cce SHA-256: e233b993bf30059a8db6c4bf9b3e7671991a620e584750406636fe904bc8a4d2
156 Risk Score

Malware Insights

MITRE ATT&CK
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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc3f357804---58317579408.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e259bdd4bcb---pajutitebukisonipivow.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075b27ba7881---56826503655.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/nasipokinizesutekovaro.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/wudejupibupamozove.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30cff92d55---67869343751.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/nobabekut.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/26081625207.pdfIn PDF document text
    • http://suaups.net/userfiles/file/97622137635.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/sijakabijus.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ade787a4c57a1a9c2a8b59c9737907e/41730404093.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/81937082280.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a94b5cb8071---lidapiwulureweretakubuvef.pdfIn PDF document text
    • https://norservis.com/files/files/nitalijutomebak.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea08bae8c0---85783813405.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/mozopaxutemuka.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d7ebab933e3675433f84deb98b8db15e/41210600999.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/g9g5gur7n3li6jdrub359iut7b/lukikobozetarazopov.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611999b2e0c06---72693946430.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/mekixoziguvokebepabozas.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/57923985595.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/xerevife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=la+soledad+de+un+cuerpo+acostumbrado+a+la+herida+poemas+pdfPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 18244 bytes
SHA-256: 6a02e6fa60bda1fade8c0a30535eb0ec107811d9cd5c256e7520d0fc7e3ea5c0
font_01_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 11084 bytes
SHA-256: 52c89d9eb1fc86f8ca85adc2081c57d75b4e5970769d99e5b78180af70f5e0c7
font_02_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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