Malicious PDF — malware analysis report

Static analysis result for SHA-256 9412e6d1aca26fce…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 12:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4cfda5558cc4bc60f86768f8a42cff5 SHA-1: 5fd9615e2fac6e5395f17c99c50162ca45adced7 SHA-256: 9412e6d1aca26fced384167633bdf010e921d08d7e5cd5b62275190d4ea7e804
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. Embedded JavaScript streams are also present, suggesting potential for further malicious activity such as redirection or exploit execution. The overall pattern suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://radtel-sport.pl/userfiles/file/38561341496.pdf In PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xedotif.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/28360986320.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/losoderoloxuwojad.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/98210410222.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/wotitivemuxos.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/vivuduze.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/vogekenepidomavozolowaz.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/novowusuvebax.pdfIn PDF document text
    • http://hjhchem.com/upload/files/84363256519.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xoxinosudef.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/wimoraz.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/dodenivavaforiketugi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a962cb652a---gojokurufoxubawig.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cb479b1f9---88750395242.pdfIn PDF document text
    • http://canadanur.com/resimler/files/luzapawizejezimametebus.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8c2bef1---63167156525.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vb6on4223h4j94rts3lks632nr/78775625638.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/povodelef.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614219374bdc7---4926971750.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/10713085768.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/pagomupisepuzemuve.pdfIn PDF document text
    • http://coumert.com/images/file/75296225742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=descargar+juegos+para+n64+androidPDF 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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 17952 bytes
SHA-256: 22df3370ab2269b22a0de2c16baff14f3c0efede78865f5b9a5d5a440d615809
font_01_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 11024 bytes
SHA-256: 909744713e23602ebc05dc32af2e561b14199fbce750a40a13d4d9988cc89add

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