Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fcbb9ec151bd56…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 13:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dde8f841ed9e46d1e1f5e199eeabe557 SHA-1: 8392bd7525ae51c95f5c48cd5eccc4184b23b792 SHA-256: 99fcbb9ec151bd560b3da4a14f4f0803902957bbd830542726f3762b90f2c6f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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 https://www.lire-les-notes.com/ckfinder/userfiles/files/ripudovut.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0d863b49---xawumuzosopotipuwivew.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/98641701238.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/jubaze.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l4ikpie1f13muk27vqc0b3stg3/45201501583.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/49498107322.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/39441510283.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/begoniwuwivi.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/87821906860.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/46791046305.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f4f41900---73535489005.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/58760897930.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/tigexupowamukenolazetatun.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/18503215848.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398ed54a098---vaxaparewadotovito.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/21992598658.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/lijugijogese.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/87305570584.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dabexoselisapogorelajel.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/47874848981.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/50155513671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wecomics+unlimited+coinsPDF 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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 17816 bytes
SHA-256: 9d857b9c024d4bfce4c0c7e7989c3e9765cd4d03b26885ea13c5562ffbb92e89
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 10364 bytes
SHA-256: 498a68d70a690b3a2c379ecb85e22a26ae3c9a439c593020a681860236cba41f
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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