Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cac3bf3df897ff2…

MALICIOUS

PDF

101.7 KB Created: 2021-06-11 01:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0f7ee238a74e8a6b7d4aff0480c0c5be SHA-1: 9a3d77cb4e11920db3c862f1e7663f8920c8994a SHA-256: 3cac3bf3df897ff24969ddc3bc66cb6634da670aeda10dace040e4b159a1ee39
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 0.9998

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 https://medvor.ru/uplcv?utm_term=attack+on+titan+live+action+movie+part+1+english+sub PDF link annotation
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/49018244927.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608df89da01cf---49102503366.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/sawevud.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rd433r0hg9j78mntcl08mhsbk5/femomatibebodimapej.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/i7ip765mu4131ten9ju7gp0l96/6782876475.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/16592473644.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/81d82a50122ae00fe172858387533c6f/16198877512.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labedufalef.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8jile9brlj6jocuc8vf2l0brhl/bapibozarezutusevitome.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608285d2d0002---91172961172.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s30o1ol3qb6u2bqj6mgsp021t1/fudusi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/12012329894.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/fimaka.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa518732b16---waverogifusib.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/42ba6c49c1e7044062cd70453d66540e/12889269799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 4820 bytes
SHA-256: b08f6b5808fc12577a8ea83af5596dbfbcae400286ebcfc87200bbaa2f623f6f
font_01_sfnt_off00014e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0E 5652 bytes
SHA-256: 8be20e8eea3ff9bdfeec759f1adf79b32cc1179fac5ee7d5c88145c7a5330f33
font_02_sfnt_off00016129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16129 11344 bytes
SHA-256: 71072a1a4b5acd6d1d4002f7cc00d4d3686ad9dab956de0aeb14ee5dbb6a8986