Malicious PDF — malware analysis report

Static analysis result for SHA-256 473f735743666206…

MALICIOUS

PDF

80.7 KB Created: 2021-06-28 23:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c084bc365a17bb86043aeb8d618367c0 SHA-1: a07d1a75be36c067ee74a109545c6b2a3cb3e640 SHA-256: 473f735743666206248aeaaa9a60d1445e4ec67eed53041808eb6474af7df7cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The `wkhtmltopdf` authoring application and the presence of embedded font streams are noted structural facts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/wisepolenedegupijikokurar.pdf In PDF document text
    • http://optikametuje.cz/userfiles/file/bobabiwudur.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/81818626020.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/12780290765.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072133c79c40---68407514449.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/55137502932.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/19619245484.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/81429270456.pdfIn PDF document text
    • http://aimic.com/userfiles/file/4795907776.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982da482c9f---wewakaki.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/67ff8b12c09968ad16ed627d45c428e7/worinumafegukebefa.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210606061206471297.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5fc29f3585a8c49ae84b4d7632f1a564/dumazo.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/xudigapatekewudizewiruka.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/maserapawexojur.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/rofuxupaseduwetipa.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/93140375237.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f650b1ca9---woralowowujirawezafo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/734966fa4d4375e0b13e09f6d0ac638e/43597253544.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc4de370f---32053742903.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776a06b8e8d---28083664479.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5dfea5837---lozazapidevinus.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jimamisumogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lamb+to+the+slaughter+mary+maloneyPDF 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_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 10772 bytes
SHA-256: d9e8187e48399dbb5abc48e388464725c7a304608433a2fc92075ab04a8c666f
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16904 bytes
SHA-256: 6fc33581fb21f293b5f329bef41f91ba11a46ff798d3e3f01540a21521d80ecc
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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