Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3530659f08214…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 02:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 864f6badc5a056b16fa3ed552c15a55b SHA-1: b234e9da61df7b0b23344c27f39ae614c78a9c6b SHA-256: a3a3530659f08214d99776abe28dc1e218c7bc9ef6ce2e468a9095123fbb5dde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Additionally, multiple heuristics indicate the presence of a link farm pointing to disposable or compromised hosting, suggesting an attempt to obscure the final destination and potentially distribute malware or conduct phishing. The ClamAV detection further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://praguetransfer.com/files/file/77242531451.pdf In PDF document text
    • https://nutstudio.it/userfiles/file/fexetajuwozibatu.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/45063215579.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/478ec62865b0c66e98d133962abf67ea/wuseviratipumadugowesu.pdfIn PDF document text
    • http://rayanchem.com/d/files/fufojasobexiketadelitoze.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f85209f92---dopugol.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd11f38bdd1---fafaxiwiwa.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/keriribozurubigido.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/86019347699.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/27c962fca03f3aa186cbd6a19da272e3/44536530863.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0ff5a8b2b---porekuwa.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/61221960410.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/47216586111.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/14675140854.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16125501f8d42f---wewixoxunutafupuj.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f056db14---82289069784.pdfIn PDF document text
    • http://devison-matras.com/upload/file/18530637013.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/vipote.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/10412122035.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bowelalakaperad.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/kowenigamefobafakef.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/rizuvobugewisatozujilid.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/mafazimovof.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bfbc49b40---58358691103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jlpt+n4+kanji+book+pdfPDF 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_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 21240 bytes
SHA-256: 89dc13b8da183de0dc0da488474482a86336c6fddd86af8287b99a95d9e72247
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10524 bytes
SHA-256: 317cd8590c412d9cefdfe156ae549e3d667c50d3715aba1dbc355553e439f73f
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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