Malicious PDF — malware analysis report

Static analysis result for SHA-256 86374221f3e9970c…

MALICIOUS

PDF

73.8 KB Created: 2021-09-22 11:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d45369005860a2ee48f3bc3936bcb140 SHA-1: 4d3c194c235f75d555dec142de429a587143b44f SHA-256: 86374221f3e9970c5ee104b84547857e89b29732ad6bc7a45e4384ca0bf2ebfa
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised or disposable domains, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://kuryakyn.ru/userfiles/file/60211530062.pdf In PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/66745980798.pdfIn PDF document text
    • http://palami.by/images/file/23789747484.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6edf4a92c8d6028ca60b618e28c877ff/resuva.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a943d2c4---67885216453.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/rovopigojekigazinonero.pdfIn PDF document text
    • http://www.bash.cl/media/file/fotirab.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/72ad3e19a7d6a1cfde61a4a1280a7b90/wekatelofitos.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/berurakakula.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/3254763233.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/49895883783.pdfIn PDF document text
    • https://network-italia.com/file/5113108740.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/96028091832.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/woposusemixidaji.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/juxobituwideniverusaxe.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/vatidevepozegegeleziva.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/nebade.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/fivonemavasus.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210912112220725.pdfIn PDF document text
    • http://baove24h.info/upload/files/23670310198.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/nukidilas.pdfIn PDF document text
    • https://maria-galland.ru/files/file/62852892563.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/kabekokebewejidokev.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/79179670511.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/vawogoxadegamakedanoxa.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/68885235579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lokicraft+2020+new+crafting+gamePDF 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_off0000bed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED3 10844 bytes
SHA-256: ab6ddcf65e0bb9de801deb741af1100c6d9de20e62c876bfe64c21d20b49021d
font_01_sfnt_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 15912 bytes
SHA-256: 1de8636041d53d2533fda6cf51bd113a1563afe60547b81a95e0866ed1d0c791
font_02_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1