Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cdb619a2a7e8e6…

MALICIOUS

PDF

80.8 KB Created: 2021-08-26 02:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e638426758c43f4a2abadc9add3703c SHA-1: 2de566511fb2d73f60258b869d8f0fb28f515bb3 SHA-256: 97cdb619a2a7e8e647d7038953d0a0d25da5744a59a52bd16e19a9bfdb6e2391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The presence of PDF-specific heuristics related to URI and link farms indicates a focus on directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://acrgroup.nl/userfiles/file/gazuwagojose.pdf In PDF document text
    • http://h-st.nl/bestanden/files/76845131312.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/17606350672.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/movemokexifanefufufifaxe.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/tefugafakinus.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wolagoxekuv.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607002de16f29---namarokipobi.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/vaxazufelabazilil.pdfIn PDF document text
    • http://vbs.pl/dat//file/legapelipujozezatifesef.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80156649585.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/30745758448.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1c8a595c0cd93f2f3343640c2d2692fb/31704988911.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/12c1fb831f47c76cb71db405e9528651/60317493893.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/8807014862.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/11040779167.pdfIn PDF document text
    • https://tessuno.com/upload/files/610d9551cfb5e.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b63e370b---15543022745.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/1051390662.pdfIn PDF document text
    • http://www.agot.pl/upload/file/nezumitidep.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ae466891bedc840f91d9a02a2ccefc6b/90669214376.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2307ffc81816ec89dcb51e122e27d871/madosobop.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/31032229783.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/12342464580.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/binarufitagewekibakuwepo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/epsh063gjeo8efgs8jjhcn9l96/panujodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=blueberry+hill+trailPDF 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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10220 bytes
SHA-256: ac9f06c26ff6b8db07daa71ed643e81a7f22234b529c9bc863fb83e459f4d27f
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 17100 bytes
SHA-256: 24c63de19f069850688f8c3cd9c1f811575af850c5e9d11f4b11a02183fe596a

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