Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7c60a8bf9178e5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 09:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25d6526888599158671a679bbef77037 SHA-1: a92ecadd793fe934dc06b54219e54038cc27eb87 SHA-256: cf7c60a8bf9178e5fb717411f113ccfe8a2fba7d224d978afc2b43e39968a2ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on various domains, some of which are identified as compromised CMS upload storage. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure suggests a lure to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5938

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://homeuu.biz/upload/ckeditor/pages/files/bosubaxomujejepu.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135812f1578f---nafedajidelufota.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/soxisatulow.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/81864197353.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/49654396745.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/subuxebe.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/18467132575.pdfIn PDF document text
    • http://mobiliteit.nu/files/26234794973.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/zipuwoxujemogufixawavafep.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/83774710277.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/46738952299.pdfIn PDF document text
    • http://orderkai.com/uploads/files/2945445905.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/2807751249.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/rowinelegidilumed.pdfIn PDF document text
    • https://campermagazine.tv/public/file/25477307135.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/nuzupugupadubefof.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b594f1f0f---42874494698.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/67223946f65291fd7ea51add1544222e/mewoxipawaxubosixoke.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/xenovujovuga.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/wasixamagob.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xabegar.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/xogir.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/13856091008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+identify+my+mobile+is+hacked+or+notPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 18668 bytes
SHA-256: 04736ec66b7653b608e8053919f540a6ae48cb3c63daa9b6eec45bc1bf40e717

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