Malicious PDF — malware analysis report

Static analysis result for SHA-256 d539d5c7a769f585…

MALICIOUS

PDF

67.9 KB Created: 2021-09-06 04:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3001de5d4fa2772b9d847745b5cac74e SHA-1: ce160058c2c9ffbd19a06373e8b94a38b6610f12 SHA-256: d539d5c7a769f5850010b0785c1b08738d51e1cdc455b3455dbfc91def77ac57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9086

Heuristics 5

  • 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
  • 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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73730bd2c7---pufavefokuzixinavafew.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa8e25902---daget.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5f0d227ce---napakozakidesat.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/96022638295.pdfIn PDF document text
    • http://recrute.fr/files/files/mosibisu.pdfIn PDF document text
    • https://thietbigas.net/media/files/93225269684.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/doruwobowexo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2625cf8de---xatulamapedoxo.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/ribuliroxuluf.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ec7574a45766556fd7637a04a107d628/13773983431.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/60201131462.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/92781643161.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b501ce567---16589100283.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096faa5cf450---37558761403.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/mofebafuteburevizuwa.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/82714220813.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2s8fb4rvjjkk8t57ng9umflpr7/gelages.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/rusagogupuruxozag.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f4e9c724---degaxubejawet.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb02349e0---91012029541.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/58767867923.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d09310bc3---xunomimefizavegolixifusig.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wobesatutisorik.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1d8771a35acf27057a3807121a70fe3a/4219575808.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0af9c772de1bcbbbe00e36fd5bfb22ec/90342778061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=alter+ego+3+guide+pedagogique+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16664 bytes
SHA-256: 41f53e9e82c875af6eac79d5e1579d6dc49de23817b97aa6f0034999afba3f01