Malicious PDF — malware analysis report

Static analysis result for SHA-256 89eaeed581d77202…

MALICIOUS

PDF

100.0 KB Created: 2021-07-28 01:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 74e4f1db3e37b173592d77387ec58123 SHA-1: 0bbe31791ab1b16f3e411adf31df2628d9fbcf6e SHA-256: 89eaeed581d772028e075d03da33032fa3de2bfb1f15c70aa49cceb7a40eab15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • 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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d62e22035---nolunevuropaz.pdf In PDF document text
    • https://chinese-wall.tw/upload/files/bukukakefepij.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/zoluvowage.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ba11d9f4befd4b6b8ad6dc07ea337d95/gojenajiwafolore.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ffdc4029e---vakolubazitufub.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/nafevezeraxixepisiveti.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099bdafcc8c8---99318389821.pdfIn PDF document text
    • http://allycatering.com/userfiles/30784417601.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/14587717847.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nmbhq7qve72s2m7htmvu0h90s2/kesawasobakuxeveji.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c209c860---60502172971.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/93786779957.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/56162405330.pdfIn PDF document text
    • http://atomleasing.ru/media/File/pubat.pdfIn PDF document text
    • http://planetamama.ru/files/file/85545846859.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7e7db336---sewozika.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb91ab0ab6---lolisevajenaruwovuwow.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/96987798279.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/deboparezilogilaxiniji.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/964c5070ad404ff887ca0d57c5f07b08/gikeropagalokuleli.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/sqatbgnjbg3p7qroerncebusqc/tefupubekifuruxapi.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jisasepewuge.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/595c9d837f31a2d53ae6bdb0ab9953c4/50706697626.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9vf027eh9bg850f2791unkuv1/gurunegejidizu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/ribelizofog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=curso+auditoria+interna+iso+9001+bogotaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 19316 bytes
SHA-256: 848832d3437cd623867c26bc7b2d9a49a6cb4a0868644efb16e3480011dbc0de
font_01_sfnt_off000143bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BB 10992 bytes
SHA-256: b7ad30afad1609ea39c9c95c355ce666558b1f2596aa0b72f492269d377732e3
font_02_sfnt_off00015d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D34 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_03_sfnt_off00016673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1