Malicious PDF — malware analysis report

Static analysis result for SHA-256 da23775597a55f0a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 00:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8dd024f823cdf568e9235dc22c7fbff8 SHA-1: b1f1b2747ce7278315fc88cfc71822b79e782631 SHA-256: da23775597a55f0a439fbfcf82f6c8d4ca2cb3fa4ccac893655b677f809dce43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=sentence+types+declarative+interrogative+imperative+exclamatory+worksheet PDF link annotation
    • http://cpspcb.com/uploads/files/bigobepuvowirokazegowawi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd1dc8109---xekosiro.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/41925348373.pdfIn PDF document text
    • https://kar360.com/resimler/files/59956993448.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/42923254378.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747de9f565---17527993730.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161368333e51c9---vorixegumu.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79e1090d7b9212b37ba0c4cf46c18565/befijoromanorosimonas.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/88473912628.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/34374260752.pdfIn PDF document text
    • http://metabolit.ru/files/file/gakoge.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16071f46f880a9---borisafewisekogus.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd33d87ba3---joxij.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/54886995544.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8o36lp5g7r9hit6php4d2epj9q/sivukew.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/26276692736.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d3be016db6c---38249727517.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effb3415e21---xiralumutumifof.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175d2a0f77---jagusakagejosaw.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gunidegide.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/29645401525.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/napuzinosikosekazipure.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zanekufejitupofoxajafefiv.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wilobaxixuben.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/96348445200.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_off0000b89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89B 11496 bytes
SHA-256: 11267e513ceda02b92148ef9e170c47ab41118027ac1ce8989ed72e5865a32d7
font_01_sfnt_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16584 bytes
SHA-256: ee72c857150755272ebfd2c7102c9f1dae5f1af3d11a9764f08bb71afeafd497