Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee67d469e4747058…

MALICIOUS

PDF

85.9 KB Created: 2021-08-16 08:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 065dcd55fccf6b53a0fb06f0cb8a471d SHA-1: 8604a436ba45c3f760bcaff5f692a947e9a4f205 SHA-256: ee67d469e474705872aba330268ac56d2c59c59946e4d8581f766f976f5cd042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pistant.ru/uplcv?utm_term=doctors+note+for+school+absence+template PDF link annotation
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/gosokeludan.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210727190143_vtsxp1.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160992837a66cc---41370170142.pdfIn PDF document text
    • https://bfull.ru/uploads/files/kaxewaposuwatosalabinu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3feb67d833837843f3567fbdb0b62fab/10807189054.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zalonozotenafobawefaw.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbddb9bcba---26081555711.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/vokuritoxejemobebom.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9146ba432cbf3d2a665aa203cb905a1e/nudivugiragoj.pdfIn PDF document text
    • http://garderoba.sk/images/_file/geliwebag.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/tabidaros.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd84af1c542---99857598435.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eea7dcb38a---musudurozib.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf1e9ba77---fukoxisapekuremametijuvo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/82379632463.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/meruwudesukoladanunamam.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gotizujomamemakeru.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4482951e59---52478222155.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a622e3a343a---jadesojuxefefazatuvexix.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/nepudosi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609761ed73cc8---luvalipetiva.pdfIn PDF document text
    • https://led7.ru/file/22197709600.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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 10792 bytes
SHA-256: b56c26832391ddf74e9c25f259b040e252ef96e3ffd44bd8140785b9f4611fe2
font_01_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 16772 bytes
SHA-256: e92072f2d0bcc2328f36f79895632fa387ca37ce287036c9c49f2e7475d6cd67
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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