Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcfb98daa0e2ff9…

MALICIOUS

PDF

203.8 KB Created: 2021-07-06 19:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25e6633d39ce64ca2e3ccbd772512122 SHA-1: b28577608880f97c11899965f9cbf33c94cf0b69 SHA-256: 0bcfb98daa0e2ff93e344898086d43a7a63380ac5c617e06850b8031b9ff690c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 5

  • 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.
  • 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://cosmic-kino.ru/sadm_files/85985370972.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac98a135ff1---nosekujodofuwevolijod.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e2dac8bb54f---87517171515.pdf
    • https://mldom.xyz/web/img/podborky/files/62572692562.pdf
    • https://burstallconrad.com/editor_files/file/rotagopijow.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4f53c357a7e077c2eba2b1b95507755b/litipewurewiju.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d6e9a4934101afaef502c7f59f73b0b7/takaniziwatol.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8731810f---detuneviworuludafeti.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/94530236200.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7a2977ca8---diwijofabixa.pdf
    • http://cameradungphat.com/uploads/files/fumapazonotubewukox.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/sazimut.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080650828c09---zijiwinogebenaz.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0479d28548---nijomi.pdf
    • https://twr1115.net/files/fckeditor/file/34819363708.pdf
    • http://cupta.org/userfiles/files/20210526225311.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8a42d11983acb606db79312d3e5013f8/70386747371.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c872f37a5d7---16085225466.pdf
    • http://asesorgubernamental.com/images/file/nixerek.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b5e0f3ee6---vudaladodotetepibeta.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/00c2lhtau6386pp40n846pmlb9/rokilosemewofazunira.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/7364667129.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tg7nhnqt5pcplvhss9ct08noea/ridujinuduvofubuvakidix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=facism+and+socialism
    • 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_off0002bd6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BD6F 16792 bytes
font_01_sfnt_off0002d586.bin
b0d899f32450dbc6d0e9ef5632761c50e880c028617f83dc968c2425be5167d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D586 10180 bytes
font_02_sfnt_off0002ec35.bin
5a96c5026730252f6bdf49e1cedbc946b8a8dcf7e7603079907f0600103e3ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC35 21748 bytes

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