Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d40d2b9ace8297d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 16:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90d7fbf3add073be16931931018dc19e SHA-1: 2ef886c76ff119160b7ab4e38c71d1d7ad3f8d25 SHA-256: 6d40d2b9ace8297d957678e6198520b75eb85c0aef9727daf842dd66e9c7fff5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm for malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of multiple PDF link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/darakotunafema.pdf In PDF document text
    • http://ohdiabo.net/images/ckeditor/files/22188460534.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/76633101220.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/81068019977.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e33bab768---falizavaxe.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/xalujoxawuziroxopizuwusoz.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/sadeludasuwuregigujukiwop.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/pejobipa.pdfIn PDF document text
    • https://mahae.hu/files/files/dodomatulaziwesi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/ganizol.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/sobedotiwuxitewugog.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/nedoreje.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/57405262794.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/obds7p9m3dpik8fkujum56h4s5/zilezexuvazekajuna.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7250c08ae1---63157371644.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e12b0ca0---12977305296.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/qlj4pb739q5k7fn6oed212m4q4/tesanatitiro.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/latabebudepuwewis.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/24910182274.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5829c154---73347563506.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/13009019599.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/a43d6312bc60882d5d28ac27a2f14b53/rudofomalojexasobeleg.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/reruvipizu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/487aae4fb780af17d28500ab13a126ba/10830552414.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c15d50d93---49058595420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=learn+letter+writing+in+english+pdfPDF 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_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 16412 bytes
SHA-256: 2d5efefff0d4194b7231c6f6e8f6d67f7b97d656dd2ec25d475303670a63aaf6
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 10700 bytes
SHA-256: 26475b616991ccb57013e9357d0f09e49d149a96459706b9d7ad64a15f70b680