Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efbd8a2e20acaa4…

MALICIOUS

PDF

150.0 KB Created: 2021-07-06 16:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01560c35516f616d4142c7f4cd961ec6 SHA-1: a27002d1a9a96f40d66b249fbf4c9672788b70c7 SHA-256: 3efbd8a2e20acaa4afb18ba3c919ed4567a9b7d932c7fc2d6088475bb2d3d20e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or suspicious websites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a deceptive purpose aimed at manipulating search results or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb461f85c---wabigemeveloxowi.pdf In PDF document text
    • http://bright-inter.com/file_media/file_image/file/4574207921.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/g88vtotkhtndljvhgs15bbjcd2/59592360334.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/sipawid.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a4c68cc7c9a99acad9b1d8dc835a1ae6/51643368466.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ac480c88154---73626023297.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/drhmdbh8o7le3h6v6cuet57dfr/jebotagomobanuled.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/31509607070.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d19a4b668---xedanozirulafusozezija.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607186d74f118---59701109002.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/sorefepufalowadofagoto.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940a769e72---xitadovowufirubagunujil.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d242bc57f5---kirosodebekeputuxa.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/94648088045.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d62aefe89---84406800095.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f864a6ff7---mekevubedefom.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7fe2qoejspp6h2tpp82f1sp9fv/rorudaraxolokufoxu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5ca949cb2ece0ca02b89d2a44202bb55/40211759401.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a64b4af70---vademojolota.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vuzirix.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9222e2baf0fecf68efa022d85b72afc7/ravofenekurekepiwuvo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3qflc1s8rnrin1dipopus8bbdm/dabukodafagudetokekot.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qq4gkm8l53fc8hrf9ltesm17bi/61303322607.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/fukunomivumomazuvuriw.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077414ca7d3f---dunap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fremont+elementary+school+phone+numberPDF 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_off0001eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAE5 10880 bytes
SHA-256: 1599e9ef05c4c5af80f5565530515929736cab166cebc3bbb90db12952999d26
font_01_sfnt_off000203b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BC2 17548 bytes
SHA-256: 35cd6b1fd66eaf15f84ff8d5ea8377542c3d3e8cd23dc9522f50f6569014fad5

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