Malicious PDF — malware analysis report

Static analysis result for SHA-256 6455485e462232f7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 18:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8163b30c22d339c1552219b87495834e SHA-1: 44fcc5befc3b275a2516186d90bb1791a1266b7d SHA-256: 6455485e462232f78241b5efb1dda07da00f287899b7973ea21a88d854760922
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rachelrom.com/rescontent/file/70842053450.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775d557f7bd---34298701349.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6f02d89d---43740159797.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/julow.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rr20kq6ggn8vmr9fu52bd6micu/60298962432.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/32907422855.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/puwipanijuneletoxemupep.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zisalarizodobozudi.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/boxerawijowo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/i706v3coeh4liqsvohvt97a5gc/mawogifezak.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/jetaziwovakixisurir.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160df824ba690f---95792654819.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913056ed8a2---70939072049.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1fb415b4d---lanobimexameferafo.pdfIn PDF document text
    • https://kristinanamaste.eu/files/14726285043.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/576d08c6b03a8ddb8934d25c0d8dd0f4/jixejobokes.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed145f1ba9---fasozusudokeferi.pdfIn PDF document text
    • http://surtek.biz/image/files/20150123_072107.pdfIn PDF document text
    • http://fpole.ru/sadm_files/877884886.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/56270276169.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee775f457---wulolisewuguvazafupogigu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ed5ce6391---pugogifuponizopijuvajuzuk.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb8af3af7---29551341621.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/1dd8a2cforjcd599q2kuko3qp3/46563633843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gta+v+for+android+ppssppPDF 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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 10420 bytes
SHA-256: c4d9d2524e2c275a615a9b1dc42062e8af8d271505e95e3949d467a171b8c94b
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 18004 bytes
SHA-256: f330bc44e3c44484874d7bf8d479c96bb159dd31ff87470a7afb6cbffc5423c1
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1