Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4df31d1c0fb71f…

MALICIOUS

PDF

86.0 KB Created: 2021-07-19 19:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1aac3cd664df13224438100f395293b SHA-1: 65e0237603c737dcf5e7e59d2ebe775ce8a7c224 SHA-256: fc4df31d1c0fb71ffcab64cb2c7d6567365f1a7baafa435782a39ef0999fb265
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to domains that appear to be compromised or used for hosting malicious files. The ML classifier strongly indicated maliciousness, and the presence of a link farm on potentially compromised CMS uploads suggests an attempt to distribute malware or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://fitsiluet.cz/data/file/belovo.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/jutox.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/nepari.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/12731134979.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3108c21e1c8e7a465e813de4f4ffee30/pikolubu.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/14305006056.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9mrc5gvibae6eien86sa835kf0/12763418825.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/rabativiwanibid.pdfIn PDF document text
    • http://usmleworkout.com/files/file/mumufasiwibamenoditovenuv.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/38549209135.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vepoxakotol.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e8abddca---19299346401.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609456816fd90---3273516842.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/timewalepubir.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/zepuzigegiralerosufebew.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/tadopowuloj.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/6178266217.pdfIn PDF document text
    • http://praguetransfer.com/files/file/46851625396.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/95042560648.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/js1jm6g716o43p230pa2tenap8/zopujogetuforotetekajaj.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c94693323---53258577797.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae4b99b62---kalimaf.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/86666443998.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/mibajukawunexi.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/18072145255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=counselling+process+and+relationshipPDF 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_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 10924 bytes
SHA-256: a63573aa0a993c65099f93fe6d85ff9d8542277f7324324cb5e69675ce6eefe3
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 16896 bytes
SHA-256: 490dd1ed650b1da6b60b89a1f814f7381a2785dd22bd906eedf4b13e45344faa