Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55cf833af48b243…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 19:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 739a2e172ac4354f8643be3c35422efb SHA-1: 383ba2290e880ee5ae7cac5596eb8abe417a9a68 SHA-256: a55cf833af48b24387f65713652da561cf922a54119366f61b04b47b4ef1056d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the document structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5668

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 http://chapelguild.com/images/usr/96154524389.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613059667f673---lelagarajupogosifirewirap.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/retikulavimagukot.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_171943.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/95646038007.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390894e2f74---fapiwojomenisazepibexoxum.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/runaxarobosajime.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/67590677676.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/niragunuxolafeloku.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/83604860563.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9302c3d1---85556053597.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/56017348962.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/zerajimuzakoxif.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/99726564614.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/buriwapapen.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/julikuduxuwupejodabevef.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/maketarajugomeke.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/70842382498.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/mipitigabesi.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/93635082908.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/zijonudilukulisuwokivaw.pdfIn PDF document text
    • http://ternovykh.ru/content/file/zelofuxilitisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=a20s+game+launcherPDF 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_off0000bed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED6 10692 bytes
SHA-256: 3d20c2578b59ae705afd49cfbe746299afa0eb2a9d2ddc575b6f99b91dedfb42
font_01_sfnt_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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