Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0386bb394ed16c…

MALICIOUS

PDF

114.9 KB Created: 2021-06-10 08:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c65a14d50890bdfc94b171529a189a32 SHA-1: a95310838a1521418206c19c2d791e83156b2b13 SHA-256: 3a0386bb394ed16c233b12394c9f3909b90b6c48b6fc4011d442d0d73482b13c
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 0.9996

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://inwebjor.ru/uplcv?utm_term=pokemon+sword+and+shield+rom+nds PDF link annotation
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2dc95834---funokilajofivober.pdfIn PDF document text
    • https://ckmandarin.com/uploads/86775547354.pdfIn PDF document text
    • https://emmaushuis.org/pages/rafijixibodeleweruxi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b299817acde---73271127530.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210530_5ED20FA65AAABA49.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9a698d4c---dipuxubaxafitemavatez.pdfIn PDF document text
    • http://russia-ex.com/doxisarefipetabe.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff79660ae6---rubukewowisiwo.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/14962979163.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r1hpm8k6lkjhddj0igars1f9u1/51068773465.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/minikaxadekudoxameguza.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/pelozibetoruke.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b83977f46---tagoriku.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae640529aac---324670619.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/89396818712.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/752dc4fa6040dd5bb061b7a5a4dc9ae5/43229434508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3C 7148 bytes
SHA-256: e0308fc61418093390da2af7823900e637b434e4af7b6c107b00743648eb24ee
font_01_sfnt_off00017771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17771 4932 bytes
SHA-256: e371fa280f3f222065effd3e2e461381f11d62914865904161587a7ff06715f2
font_02_sfnt_off000187fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187FE 11676 bytes
SHA-256: 8ee8551150372ff98ca1cc7f13eb52aef405a7b9520f32a87b9bb3594369e629
font_03_sfnt_off0001aec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEC2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333