Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab0a4f76a1b9867…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 12:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5a48c91d2f1747c94fe868ce55f36a1 SHA-1: 9fe9116a6a459053b997a702b7c269be68516b75 SHA-256: 6ab0a4f76a1b98677435260e441e68836282cee043c6574f7f1188f5c3081dbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis indicates the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an intent to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=que+es+el+modelo+biopsicosocial+pdf PDF link annotation
    • http://sparan-art.ru/ckfinder/userfiles/files/32436864209.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/45751725932.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/93365582737.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/befunobadolamubatilix.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/navebim.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/fofinozuzoke.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/fadewazutafumaz.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/wokidumiw.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///3874829312.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021062715720_987994414.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/lofuporozaven.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/sataviliwinefuripozafi.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/xanejutib.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a19fcf94544a6a02b17ddd9f91ee87a2/kojamawenaporezen.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2c963f187---romaxabalurejavezuke.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bde989ae104c315fd1e1ae1040c5a5f1/21786128597.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/tujupamunigukegizu.pdfIn PDF document text
    • https://luminex.pl/upload/file/25519505614.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/59313209635.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca5843a53a---25266214974.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/55843784834.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gogiki.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/djv11bn9q9ta3jlagae7bpphm9/79370224699.pdfIn 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://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_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10780 bytes
SHA-256: cdce91e2d1a0c48c32ca9e9838a0c9a439bd7e54fe63e294a2447281b2b89b72
font_02_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 20612 bytes
SHA-256: 8db169a13aad3ad8f6c0f11c0bffd2573019af3b871dcc9dc48ce0aae88f6111

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