Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5943505f8b9806…

MALICIOUS

PDF

95.7 KB Created: 2021-09-08 02:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 360a0287c6c833fdd232cbdf24b118d6 SHA-1: 881e695a511e28cda3f49d3fb61968ff02ebbd47 SHA-256: 3b5943505f8b980636ce1df38f72c77be78a4a28db5603125230cf6e0f835363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The presence of a link farm on disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=latex+insert+pdf+figure PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/de9a854e6e07266590d4cc9113eb8856/litubedoxipomibi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f427d793cf---80904279150.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbef21d4eb---xexixub.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bbedf49fe3c---pusavar.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4819db5759b400d14b182d2986c8267e/wodetek.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f68288a1---lavib.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/36765667335.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b53e42edc6ad95df0cbb1bf631b62b7b/24242402545.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/88280586c8b97b1c33a31545b9c2e57f/45844995462.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210603092708.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/50583638946.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/40831911358.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/gusetarefaxewetepux.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c66d3c132---30387708437.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/97115413994.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b27a1de57---kixub.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607954aee3598---84845926503.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c63ba7f7---36753903088.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/98942048382.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/subusexexojogofaziv.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/v5ujfoo3ns03a7dqhq5sth92rb/bexakavadasol.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jm52gqq2s02n6grjf8bc91bs6r/6934293824.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/81118381294.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c623300c94c---nosexaro.pdfIn PDF document text
    • http://texmet.pl/userimages/file/watuxijusenorepogij.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/42a97fd086521172e03c944d79c0d35d/kepapize.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/vosobogonerizogogef.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafc89c61a---64937463783.pdfIn PDF document text
    • 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_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 18908 bytes
SHA-256: 518e42e13e4a309eb2efe9c644c0d0807803ba919452c912ccd34b45ee387371
font_01_sfnt_off000140cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E2 10668 bytes
SHA-256: 8c46287b1d76cee83f43d82b1e663ab6e03c08a2f49b71a86d79f220e4eb1cb2

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