Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d0fe5d1b5889fe…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 01:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de082155456455ba9fb6f4912ea50528 SHA-1: 0795dd4f29aca3acf1f277fff41e284f6b0ae452 SHA-256: 86d0fe5d1b5889fea8c66770d053f238e438b2a5c6ca201034e9836a138d1b7f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe460d86d8---19097546852.pdf In PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/60177034055.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/texuma.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/m3kp66ictrn139pdenb3k83rd1/jumuvomekuxotidosuvovir.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cc54a9e9---31492255002.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0429b1bee---56338904437.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5272680545.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16136946857c50---lavumodosatuxesazaj.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/35450552749.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f71920a58---77014271312.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/uglggopioga1lv7leig8agmkuf/88423432891.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210816/210816064614305014gc1hyijormhg.pdfIn PDF document text
    • https://flyags.com/editorResources/file///jizereg.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/59737169264.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/47540902680.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/99014729496.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/59051953701.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/9415213361.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/madovovexoviwagipoxu.pdfIn PDF document text
    • http://mosjob.ru/images/file/garivomafe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160be35ef03969---97911673663.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kubodud.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/34034470015.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/rupegexiwofadomozomiminat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=principles+of+management+notes+pdf+for+mbaPDF 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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 17860 bytes
SHA-256: 22bc9262a21429a31550410616ec2d6345e9bc7dc72c4240cb0c3e64ae13fe79
font_01_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 11104 bytes
SHA-256: d17071f478e4e6305fa5dc5fc30e467918b6be8fbcf29b70afa8d7c0ce103026
font_02_sfnt_off00013ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1