Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dffa06b179a7ca…

MALICIOUS

PDF

83.1 KB Created: 2021-08-15 17:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 01eef1bd0d62b7c84c0f4cfdee31a478 SHA-1: 72e4222b9bf90936c4fc586982392cc2f3189777 SHA-256: e1dffa06b179a7cafe13114fabb269e0b033fc2cc65c39a3f978c016ae341a0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9003

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://chcial.ru/uplcv?utm_term=1-1+mathxl+for+school+practice+and+problem-solving+answers PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rapepabanate.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/57313606255.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/26174636127.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210608_180533.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec76c0ca8---vopurojobajubijo.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/xurobelota.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivarutuvew.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/28206125165.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dbe3445e---totimedosigetutopazodike.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/zetumikerivudafaliloxit.pdfIn PDF document text
    • http://asfalon.com/__files/file/gemujepisazodaritosugel.pdfIn PDF document text
    • http://iworking.vn/uploads/files/vurevumiw.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0d2fae23341308d31b0346c2e2ba2fd3/zakulalukapafepalotawiber.pdfIn PDF document text
    • http://ashioke.com/images/library/File/libogawatekan.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///zutupedofer.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/mamon.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04e375857---92285928761.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210714_C0D5DD5B6B50D13A.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/fatonujununi.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxeteze.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/wajaletak.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/90461220770.pdfIn PDF document text
    • 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_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 11452 bytes
SHA-256: 232e878b292388a03c0eb2786e3c76381e357e30a8a7baab93a9b65b1ac7853b
font_01_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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