Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cfc5f76c637a6b…

MALICIOUS

PDF

109.5 KB Created: 2021-08-05 05:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36c71fe0699ffc7ff2340c75a2c68305 SHA-1: 784bd014ff6745106d1d930a5d6f22178a7fca46 SHA-256: 18cfc5f76c637a6b0607729550d4a44b43570634e6c9d8f8fe1e0f4df4c1b4af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • 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://iphysiology.ru/upload/botawu.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807ab80b7c6---36373888921.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///jomubuvekuwaf.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/menip.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/15521206339.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32177427695.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a9c7bf38---3067628260.pdfIn PDF document text
    • https://cape-electronics.com/media/file/97506707748.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b38df656e5f---97067930353.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nemes.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/totubasifiwodo.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/vogapino.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/2326360119.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/nirofimapuxij.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/30844164119.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1329867ac7---wuxokijiguroxunowubejitex.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e36b0b70a---wikosunutafuzutej.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b7eec965f4355cc3bd83bdaa0c8e92e9/83296285469.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca86229c08---rorupo.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/ea86e5898adcab4b6050a9768febb196/41675040238.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tomafokubarapuvokeluwad.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/74832896331.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/zilukokokokutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=corrig%C3%A9+livre+maths+terminale+s+transmath+2012PDF 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_off00013b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 22664 bytes
SHA-256: a1c05b2c739336b2672ef09c197672db3f5ddd78922e2fcde2e1667563ed11ff
font_01_sfnt_off0001734d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B64 11100 bytes
SHA-256: c1feb5df73871710584a47eac7db643505c21d322dbcdb45fdcd45220f358780

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