Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b2a18d7d3b2ff4…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 15:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e1776ab4270d2347c942549a97f9d413 SHA-1: 67b046a1d87c800ce2654d394ad6740cdd284674 SHA-256: 69b2a18d7d3b2ff4628ab0c9d4bbf57bcf4f3b95bca52c10d7fdb0bf71ef37c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e1de6746a930a66ceffe25960518a482/dujifi.pdf In PDF document text
    • http://interstyle.org/content/xuploadimages/file/limeni.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/xawufazebemojidigim.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e421e44e2cda26db28a8e39573751c8f/5309964902.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kotunipotesowulev.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/pinamafufufis.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/zuruzezimi.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/kemalisikad.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/85589951949.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/47387773651.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f7840951a1cf0326944e12cb58ec458a/telagi.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/jebopokipadoboregi.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/88111867339.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/39676680082.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/jefikibivodemifotaj.pdfIn PDF document text
    • http://cissi.it/userfiles/files/2290545308.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4qftpft53v8qss8eg0rldcq5c7/wevijenudogexitiwape.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/4941840711.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/davoxusugizi.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/28fab5.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/vaxexaretiwofu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/458984c86226aa309af48d5f62b71375/63328674476.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cd4c7062fef38f562a2723f8fc3c141f/89725245132.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/36874123686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=roblox+mod+menu+apk+free+robuxPDF 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_off0000afb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB6 15892 bytes
SHA-256: d8f8f15449eb9d22d3a2cb845c6a8b2cb9b2876490905be917486a0a79594056
font_01_sfnt_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10780 bytes
SHA-256: 7b91d356f9e3e44a77afea3cfd1e30a6f1692fdd1f9e8f0543a391c634fc31fe