Malicious PDF — malware analysis report

Static analysis result for SHA-256 7671a91dfe1eef6a…

MALICIOUS

PDF

83.7 KB Created: 2021-07-13 18:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dff26ad2c5201dda84ddf85282f01d92 SHA-1: 43bc2693a3238f6482728cb6dc35648b22c67e34 SHA-256: 7671a91dfe1eef6ae8caab9e02e99b9ac30a9a855345564af9f8fe3e2ccad134
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=star+id+alabama+appointment PDF link annotation
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2df59ef24a---togizajabup.pdfIn PDF document text
    • http://armanetti.com/images/gikovororejonenifamagafiz.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/4f116680d8d19959d859393a60163de7/48541581301.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90f670547---zezuvi.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/52702598928.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/68616767623.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094deaaf1738---jibetizowufosek.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6c18925475e0d69a6c3956303bd0e1e8/89272002733.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/suzipukido.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085003fbc8e6---10844806110.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bkiql8c4jlkm942qtrr0skgd3r/votujixanepunadifaka.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/195f31b2573163888ea4904555ad7e69/xonuwila.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/kubewanakesepaviledejive.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fa008dd6---13618554258.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lajapivevo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b1ab3e57344bb1b8ae35705d5f226e0a/tekuxelo.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/mamovewalobamexuwam.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a467348c53a---77679870914.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/tanosa.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5ai1d6hh34frj7hceksumiqa2t/fuputafegejamipunupuno.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/libewasutuxomukepi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d9191212f6b40ab8d29cec8b2691320/kojobufadifuluxogubalog.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/wapalikatekorivutej.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8090685e33bf0253424346daebf994c1/74729952512.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10600 bytes
SHA-256: 5ea2963d70511317d638425010a23dd2b6ae5958b285112cbfdde43020048557
font_02_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 17024 bytes
SHA-256: ce86ca28ff8a95d4f516f08d3992171c8a305f7bd7b9ede3f49fa962fa2ceabb