Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df857e9ae0a7d96…

MALICIOUS

PDF

80.6 KB Created: 2021-08-16 11:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce24b9607575fff8d41f9973ce7309d6 SHA-1: 03bbba955ef71881ba5df7552fe8f52b99319081 SHA-256: 4df857e9ae0a7d9660fb5322d99700fd83d44809f4009360d77f8fc3ba34dabb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggests it's part of a phishing or malware distribution scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://aarhuskortet.dk/images/file/97078967362.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74de9a981---kilejoravaf.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/logotimakar.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/safewewevi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/mkb30i76mnr6i33tei10p1ftsg/13055742521.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/19375811951.pdfIn PDF document text
    • https://numberonerevolution.it/file/beteponaratopot.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/tarurobozoxika.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/tigoguxe.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/jedorelus.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/fuxafujotu.pdfIn PDF document text
    • https://taperagi.com/contents//files/20044607010.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/34446175647.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee6f6338f---nuvusibexomeveka.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f0a66f7d---romufo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bu9m7nheqqbc3nskl18bbv6sr2/kexanuxorifikitufuvi.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/78245957952.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/0fe3f1ad5bd5e1745200305437d78e1b/70291461436.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f1f5283d29ad7bdebe8a8edf9f0573c4/jebokafinosasadabelirife.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ecfb1bec615---kovalinitul.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/depixubarigisuxureri.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/lofesedogimexakusozof.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/s1e12vrk49pau4blvlmsb7je37/42901340083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=desenhando+anatomia+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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 19236 bytes
SHA-256: 2e104999a26381bc73aaed0f4b7b4d098213ee7698e487180c1931b156d44256
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10616 bytes
SHA-256: 10e6933617301a0c403dab3f3cc75ae26f521a969dc7f024c8c18c940c05598b

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