Malicious PDF — malware analysis report

Static analysis result for SHA-256 99125b19c3f7daf7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 16:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ae1ed95e729d4cf59cfe18a2b7094c4 SHA-1: 03975ec10988bcf67807cb3553e03005e339f088 SHA-256: 99125b19c3f7daf7eb65f11afc00fb0911877359f61bf2e092cf406e013f1218
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://xmst.com.vn/app/webroot/uploads/files/zubijuwadirugezevixugemew.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/10220af2f958fdd6537284f2ee14adac/74330572679.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/jogatefalavix.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2db81f871---wegesutodavizujatapi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/39692198314.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ee308d1c---xufevix.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/73197088112.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/85164916641.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/27550227502.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/53890342572.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116634e948e8---kuzoniwud.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/44409748808.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/nsd5tmkp63nr54h0lfao13tgsk/70688856932.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5787883550.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/619f6b27236e4bd75bc581424d6ff63c/68054863176.pdfIn PDF document text
    • http://indemo.pl/Image/files/13528340967.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f8a1e7672d494dbe8be71a0907b95ba6/28285996677.pdfIn PDF document text
    • http://imi.vc/upload/files/28145646644.pdfIn PDF document text
    • https://2acontractor.it/images/file/rujaga.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/68117776117.pdfIn PDF document text
    • http://friulanapanini.com/images/file/vejadowod.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qq8jfjgs9l36a54u18bf405tf8/dadipavigodanugudewifen.pdfIn PDF document text
    • http://edgecs.net/documents/jufusajafokijiwinijapejew.pdfIn PDF document text
    • http://vodnik48.ru/content/file/55776286873.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9347e18a6972fcbc17b5b5e7bc5e6de7/lawazinezulekigupas.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/govavoza.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16111601260503---80726935445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=professional+development+plan+example+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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 10828 bytes
SHA-256: c6509376b6109d946d24e40641d57e0b7b6ecf55d7ec28f1f9169e1c0ea6191a
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 17880 bytes
SHA-256: cf999e982e2e3f7a7e834850098d22b41800cbc8692bbe48527de2ec4f8c4b4e
font_02_sfnt_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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