Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ae0d8c3dcbd403…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 06:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 078c760c30d5dea77853645826919c76 SHA-1: d1e76fbe48c409d8d519de79d8933553ba0b211c SHA-256: 08ae0d8c3dcbd4032750ff4ae0f8e81082a6a1b3a4a857072ea03c6519c0f967
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • 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://hexindechem.com/upload/files/18994381115.pdf In PDF document text
    • http://ivankrivanek.com/userfiles/file/feximedinarif.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/96907906548.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qfq3smefpca3v8obqrq3s835k2/42662569912.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/70191255066.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a9870737---zosisi.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/77558289580.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4231781ae---nukiwizasadasupodew.pdfIn PDF document text
    • http://blgjad.com/upload/files/46809431693.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/vanuv.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/4280128572.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/nalewo.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/gogonovefosutugiruzone.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/basebusaxosagev.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/32749544975.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/95626706159.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/88789185806.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6e76e92b93a4de55e166d324784ec9a1/boramalasipala.pdfIn PDF document text
    • http://lagrupacio.cat/file/rupago.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/witetegebopuruvubo.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xamerubevozuzikigaxupen.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mubonukawawutiji.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/sijozidisuwuk.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/valarelagelosipikepom.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/wivogazurabimi.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lagulokan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gravity+falls+journal+1+read+onlinePDF 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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 19184 bytes
SHA-256: 664b1b7d503a409dac99c20c02972e9c5d2e62f038a0842075a032bc75eec0d7
font_01_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 10848 bytes
SHA-256: 600c351a3970300396ec279c550f96a6b90beb9019aad38b8998ca48ec5652d5
font_02_sfnt_off00013ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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