Malicious PDF — malware analysis report

Static analysis result for SHA-256 541208d2af10ab78…

MALICIOUS

PDF

99.7 KB Created: 2021-10-09 16:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f8f2e004cafb5d3f12e2c2d545c4e56 SHA-1: a71c025a318e8fc3c93dd86768140390add0ce40 SHA-256: 541208d2af10ab786243ce6ca054867812d0b233067818c088b58ecfb6dc7ccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://catamma.ru/uplcv?utm_term=the+republic+of+doyle PDF link annotation
    • http://parafiasadkowice.pl/pliki/monerazikozilevagumujuxa.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16153645dbec88---zozago.pdfIn PDF document text
    • http://zenkatsu.dk/files/xolaso.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/88431166857.pdfIn PDF document text
    • http://ihdbd.org/upload/files/juweturijuse.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615d9a2061e2f---jezudavizaxobufomenip.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/vawusijumixebuwew.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/83228344410.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/12631425385.pdfIn PDF document text
    • http://uniskycn.com/userfiles/file/LianMeng202110042003477901.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3qfdggrocb40i7t0lltesitpn/juziworenevaperolare.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/55273267974.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/janelelubiwulo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161596030cac---12862684721.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/36602803005.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/20441498390.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/pugozodediv.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/75852556368.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/wogaxitu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c702391379d3f26c172be8b912ceac9d/juwodolotiveb.pdfIn PDF document text
    • http://cwesp.biz/upload/file/60936858861.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/5859579944.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/82908235690.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210913000230.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210910_171017.pdfIn PDF document text
    • http://recrute.fr/files/files/79234854330.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_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 10504 bytes
SHA-256: c10ce9adb4ba5615c0a443747463a565af5eef23f134db0e77d57f11de952304
font_01_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 21240 bytes
SHA-256: d1caf0134613a2d95ae9ead431e4ba8fa5fd46efbfdf71182a5937b6c1c9847e
font_02_sfnt_off000168c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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