Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54c6c36b331c83a…

MALICIOUS

PDF

94.8 KB Created: 2021-09-03 00:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 346bee59851580b0e8247dd8b3f8ac00 SHA-1: 3016f386e2f0f8f48244805f6f14f2179cb55bd0 SHA-256: c54c6c36b331c83af45d6e2b669e51e1319588fbb73d045f2586658d4543a6a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://plnjl.com/userfiles/files/wedonazonametevodapepu.pdf In PDF document text
    • http://abwingsde.com/uploads/files/sapupolofolewusejol.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/glhik3rl4nkkf2pqujjgtb1q96/vepale.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2f562d20---motabuwa.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161091b7b72d8e---76802177597.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/rowemuwetigaw.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/26a52496ebb9f30a856b3be6d20c3653/futubovive.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/jijik.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc105cfc97---81282654879.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6b476018---46663920021.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/ce4177e69b52359a75334a6a4e0e5b16/faxudarutevuwivab.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3b5c9faf---pugepapaluvam.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/86329012135.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/72dac7748b56c9252149a73612951307/53154103220.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cbc3f8d885d6da82023e9ec051d3722e/89158472141.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/xawiseloded.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c55f0a625---kesezejipavasesoxozuda.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/webudakikovusesori.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/73990578468.pdfIn PDF document text
    • http://esistore.com/userfiles/file/75656403917.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d6ebe89619a86e5334d276b7ed719431/risofukimi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/183321ebe7667af6f52ab45dbdd75bd0/moretalatijinelulemozenem.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wenojotidejiro.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02d1ad145---76536742989.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1e47738a6120f459467a33d5cfb43b97/nivuzewodagotojupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bjt+transistor+example+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_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 18136 bytes
SHA-256: ef171c01dbdb52793e0481a208a4c72d41d745b86a1c242c3b4e62d3d176bf55
font_01_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 10944 bytes
SHA-256: 6c268875935fee775287ce46b4e0dd17c65d96cd3c8ceb560b16e957b824c39d
font_02_sfnt_off00015590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1