Malicious PDF — malware analysis report

Static analysis result for SHA-256 c920b1ae88724b25…

MALICIOUS

PDF

70.7 KB Created: 2021-08-01 11:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 852afbc2542dac6d38a4629e40e0be8c SHA-1: 5caad5f872c3bf7c7fce4c24c9c802eef401ea7c SHA-256: c920b1ae88724b2593bb6fe686e82380ae48ff4306c63a2eeece5a69b4eb8aa3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • 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
  • 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://mxagproducts.com/upload/browse/file/tajuberakejor.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fc4e3e9f9f3089b5fbb538882c661647/82234532567.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/30219096592.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nuserifuwukabatageripega.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/47856271609.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b992cac1c54b08fc6f14c66caf0cac71/nopufe.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/xegagisagawanukewexoje.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a459dff1825---gixigesemo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160757c92a1314---kunasibuxenurasizuwemibe.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/91d8ff161770fb7416f0932dafdead5f/5853931765.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/lolenedogawikitaretekurol.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085276a9eb28---74549463329.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/vixawesepatovotipug.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/89390812684.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae052d3748c---93037544066.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084d385be918---tenaparimebogexop.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/wefufanimiguxem.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d6e6a4eb23b65107dffe8d905e64b9e1/86317933050.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/25490530871.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/50f09de1c27f3f2ef6bb88b97003039e/82679052764.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a942f076be---37997629215.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/55560192278.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/ruxinevaxexabajomenodot.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e5f0846646f9a681a63102e87486e22/87270404332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=realidades+1+capitulo+4a+asking+questions+answersPDF link annotation
    • 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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 11288 bytes
SHA-256: a471e6ddf2d7b6e0e4f06de4891205bf0eb6ffac551588e0561e863e1d1ab9de
font_01_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 17364 bytes
SHA-256: 7e99c80bc5cf04cc71186a67e442fe501409416fb67957a94d8d2af0c7ce998a

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