Malicious PDF — malware analysis report

Static analysis result for SHA-256 78920bbc7b292030…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 19:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0d96c5a8dd7bcdcb9cd760f5f3ee0bf SHA-1: aa1cde5f9c1bb8a7c5853d98730c02c94f5bac07 SHA-256: 78920bbc7b2920303080ef9179596b4658178657a30dec74685da1e249890493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=fifa+15+apk+android PDF link annotation
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161309499179ec---nelekibakifapilobowop.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/24828869854.pdfIn PDF document text
    • http://pi-consulting.ch/download/fasopivuzitunogoxum.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/betatox.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6e8220a9ca9b1a229c1c92ee7ca866e9/45819784231.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4676c1bf---lofize.pdfIn PDF document text
    • http://stylekd.ru/files/toxonomokazovidenurubon.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/tafazolevututizuw.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/niwinakamuk.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/21882106117.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210914_042736.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80708404a---20565479916.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/juwalemupodowigelezabake.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/56627071666.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349716aff2---logunijaloba.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/41373461292.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/finuvadisu.pdfIn PDF document text
    • http://njchemland.com/upload/files/48025569074.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/nofaberepup.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134a0edc4ba1---kutufesilufu.pdfIn PDF document text
    • http://dobermanncz.eu/files/71666255311.pdfIn PDF document text
    • http://plise.org/userfiles/file/lenumenejoguliw.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_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 19612 bytes
SHA-256: 63f0757b77ce6fe8b159849420da17a8aff717ca825a6a3439fa76a4bf67bb88
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 10304 bytes
SHA-256: 7cd387d8be7211794448cd5b04e5a2a2522651830bc3c411b193b06ddbace769