Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac874ac7c17e55b…

MALICIOUS

PDF

121.4 KB Created: 2021-06-30 23:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7bfc222598df4fa3d458f96e96051a8 SHA-1: c60494e8ef35fe756988af9bc7a12d3071d29f8d SHA-256: aac874ac7c17e55b4fc8add3fa78da4a6ccc39104b0d3eb93292dabd26144510
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://medvor.ru/uplcv?utm_term=vitamins+and+minerals+worksheet+answers
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39918bf895---kaxesalunuperujuvimen.pdf
    • http://stphilomenaonline.org/userfiles/file/92639625100.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/745956cf531ef17575a8954538d2662a/jofakafakuwofuzegezaner.pdf
    • http://microlana.com/ckfinder/userfiles/files/tetojobugorajasa.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dae28eebe7b---69867284987.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/n2pnriuo69l9k0mh3l8pvfpt7a/godapaxe.pdf
    • https://keluargamimpi2.com/contents//files/pupasinujasagakita.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/59798419631.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a94267c9724---69478202262.pdf
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/34633960446.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/62246705694.pdf
    • http://cestovni-postylka.eu/userfiles/file/vewugukesimufod.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/86663887516.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/74257745420.pdf
    • http://accessiblevehicleservices.com/userfiles/file/reribadod.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/q0rildl3b4cp80ftcagpfsat13/8520984848.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/80629829951.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tbjem182eslno5m33rusavrg93/zetewupulu.pdf
    • https://noihoithanhtuan.com/media/ftp/file/87139180581.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gagoxamamiw.pdf
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/vedisokozivelanasunubeji.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/9562f048dc54360cf50a0d1fc3c341e1/80478736599.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d06906b6---99278210585.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce135320f---59001507743.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000178e0.bin
8c0f45d41894a19470989fb2798e470794a1d3e954467a38570dda901340c6b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x178E0 18228 bytes
font_01_sfnt_off0001a7da.bin
c9c877ff0d23e0cdad315afa4f0beb6212034c1fd1e784657d2eca991276858e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7DA 10660 bytes
font_02_sfnt_off0001c019.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C019 16792 bytes