Malicious PDF — malware analysis report

Static analysis result for SHA-256 8916be7e94627add…

MALICIOUS

PDF

55.8 KB Created: 2021-09-30 22:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 145d45cb5423aa9b63a31213c924c908 SHA-1: b3499950ba945e91cb8e327d5a2382962ead7966 SHA-256: 8916be7e94627add4e334f38deed5b3be4602b0007e54cb14bd0f6dc31a2ee0d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as an image-only lure, typical of phishing campaigns aiming to trick users into clicking malicious links. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8102

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 55 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=upgrade+my+windows+7+to+windows+10 PDF link annotation
    • https://haysalon.com/public_html/userfiles/file/12505537083.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/dirali.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/67621670684.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/33643159950.pdfIn PDF document text
    • https://rotitelor.com/contents/files/26392252576.pdfIn PDF document text
    • https://msiutilities.net/documents/tadajatuwodes.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/60196444380.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f7adf2d05ab113da36f1d79db3a4d2c/85655611844.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/35685448741.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/fomobuwixadiduxolepufetax.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/81086481821.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/buliviguxebu.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/18322026086.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a78b92aef570ba6cda3b5432c45abc1a/3004976748.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/177718478.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/nobijoz.pdfIn PDF document text
    • http://kezmosas.hu/files/file/nojonimeveg.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bf99db86---kexujidirupawevibeloluzig.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/84146442212.pdfIn PDF document text
    • http://bluebossa.pl/files/file/padulokokuludavujeg.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/jonibudutoxarife.pdfIn PDF document text
    • 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_off0000ac5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5D 11120 bytes
SHA-256: 372abf9b791aa753824830567d7b626ca43c11d8d8e4032488b9f49d6e7c40ca

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