Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d63a08175ac5b5a…

MALICIOUS

PDF

98.8 KB Created: 2021-06-27 18:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ccebfc04629ae7e76add1792046f6f9 SHA-1: a2dc733de9bd59ab63b6330929b2e602a60bf39e SHA-256: 1d63a08175ac5b5ac67bac5ddf75216ffb65fcdd0bf2490284ead8a1622984d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites using the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and a high number of links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/fevoligejegilos.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pinikilanuma.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bea7c12e6---metikidadiwezizomutul.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9e782a4f---rorojuvobonirogogegulix.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/nuzawijawabanifasaw.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160909b3071cf3---75375160014.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e05c664003---45402614973.pdf
    • http://agendatourvietnam.com/hinhanh/file/49402823714.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/242f6746720c406f16db49c25699b55b/zikakexojaratukufozewar.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41de5a0e3c---vomoluwafusizomuko.pdf
    • http://laweasy.kr/userfiles/file/lobovisolededotomonoza.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c724f0246d---rameresojugudupu.pdf
    • http://menafundinfo.com/userfiles/file/kelefekimipulaxoluvaz.pdf
    • http://ed-web.cz/userfilesfile/98397945910.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607838069ab03---xexekomit.pdf
    • http://karlsbach.de/userfiles/files/dibeligubudi.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073aa6c08fa9---zakikona.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210608_05F01BD9409FA613.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6398d57e81f0ad60aefed8a5c89a04dc/verapivilizis.pdf
    • https://aplusadvance.com/naver_editor/data/file/61296028033.pdf
    • http://dwhs79.com/clients/15834/File/datuzi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=definition+of+hoarseness+of+voice
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f5d.bin
6f3b7b5d3a155abdd1bb6ab7830c038e0e23c9c60a87dc40f05fa16eba08c981
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 18132 bytes
font_01_sfnt_off00014e19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E19 16792 bytes
font_02_sfnt_off00016630.bin
b12fa373e220ab251c07f0d7dd9f6eaed44310150519b1d6391e7415b49df879
pdf-font-stream PDF embedded font (sfnt) at offset 0x16630 10452 bytes