Malicious PDF — malware analysis report

Static analysis result for SHA-256 e844ea66adc6ac78…

MALICIOUS

PDF

96.7 KB Created: 2021-09-06 03:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95f3091ab6eb1377fea6ff473f08ddbf SHA-1: c3f41076ae87d2774dd266bda92179cd179838c8 SHA-256: e844ea66adc6ac781182bbf2d321dfcbd2139fd989a696a15d4ce7fb05f52550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=celestron+newtonian+910mm+telescope+manual PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feba0906a6---popilofeg.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/nuzuribivupo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ed3259ac---najelem.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/82882928194.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e4a8bc87f---61681284566.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c6477f22---98720694579.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/jomufedajaxamadebejadun.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/bagigafixu.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/9284862646.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/16845072988.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/pekesupanozowovobe.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ab883649---48330798094.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/63726880825.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ajrcuarumhm8pnf3u8kek83bln/fikegozijubamenog.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/28143585768.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f70a3c3fedfd2d558145595653299312/67077500232.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0f871e71---lafiradovemetikasofevoto.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/46b688f42e7224cfb4efa3042b0efc52/30774985912.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/taxesil.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b991d84adb---22173541064.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wozivil.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/bebc3d79bd108eaf350bf23ff943d441/wuzasexexagibaru.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/21938994265.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/91526085497.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_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 18316 bytes
SHA-256: d31baf8ffc2bb7ad0ba9098973b65f7368e53c4c22dc3911f7ab40e86a114ba2
font_02_sfnt_off00015ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD2 11096 bytes
SHA-256: 8a3ae473f3e18df3fac1afaa99bf6a486779a7e3501d0a56ad36fa6c74ea5c6b