Malicious PDF — malware analysis report

Static analysis result for SHA-256 e107a1533e1d22a9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 09:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8ccc1f08c7e91ca55d78cdbab715e78 SHA-1: 80c5e5c07d3a5ca9468e4b594ccba8c2caae6e70 SHA-256: e107a1533e1d22a94e6f5473e33f55351d691e2a44e52e72343fa5083c33977a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised websites or disposable hosting, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6037

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://atpl.aero/ckfinder/userfiles/files/pejasalozowapejumuwogese.pdf In PDF document text
    • https://fajanav.com/aym_image/files/15576487851.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/dupikovulog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac8d6ed48---wegotivijitijoweb.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab8a8fc67---89205656934.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/28139940672.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/zeruvago.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/5867807446.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/jeguvada.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/7082165099.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/dudozuvofe.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/kaleduwaf.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/jugiromenuku.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lamozoparurevibija.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/24334794062.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/ludoxotarifawobegil.pdfIn PDF document text
    • http://eternoohydro.com/d/files/xobujapevi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3a790eab---sinenipigisugiduxikuzevu.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/3920401383.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/48562684129.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/18640264805.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o76if5g8iis4cjvjfaljqmcddv/dobijukiwirijudulad.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/61957843789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+photo+effect+appsPDF 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_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 17452 bytes
SHA-256: 3f6d3b0dca299d7dd6723606f6109b1687baac21a87488ffe67a7565ad7dd4b1

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