Malicious PDF — malware analysis report

Static analysis result for SHA-256 16de27e90936a33a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 02:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fbd1e358e743356fd05861d929327a7 SHA-1: aef306db64327a88886d231229615729ab3196a8 SHA-256: 16de27e90936a33aec0d4dd75359c9cad448965c7299b4bf4949efeeed71d6e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/58fvsckn8ej9ppmn6rn007sd1pfr70es/99684818463.pdf
    • https://pieseautocomenzi.ro/userfiles/file/pukevezurusilapivipera.pdf
    • http://xsteelstock.com/d/files/reximubejok.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/pbg3qip6f4tcdihgveb0q3ll52/tenaxid.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d49ae0b4f5951bfb87427f90251d10d0/xotapatunonorabafaparuj.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5279c3c57645cb13c74a5b7ac395c104/sirotuxipezovunebofe.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/63945038279.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4d26f4e4---41226874709.pdf
    • http://www.yoko-ono.be/images/userfiles/file/90064589664.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffd906f7b---45611701050.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/c6ace2gbrrt8ksm292jcembr8m/geruperitabeje.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b882a8deef---bomurulowetijewa.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9bb1bb0f0fc0177af05f2d237c34a203/81188485906.pdf
    • http://faurau.com/luodan/images/userfiles/file/53451732.pdf
    • http://dongduong.net/Images_upload/files/48075893602.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/piwiliviv.pdf
    • https://rpdev.org/ckfinder/userfiles/files/68734169639.pdf
    • https://propiedades.net/ckfinder/userfiles/files/kaneruwomoli.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d0b0212d---16173865292.pdf
    • https://uleiuri.ro/userfiles/file/22094533057.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/dajakegob.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/53a0e446e11b57cfaaa3a9964e074d69/tasuja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=slow+cooker+christmas+ham
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce67.bin
59aefe34d0c14271adae98c3e25d42b5e91f5a979a1d7ba1444f040038b145d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 10644 bytes
font_01_sfnt_off0000e6d6.bin
4d7213d817b32c6a3922acc066e8052e8b6dd9061a25a9f7f7015c2ee8eb888f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 17340 bytes
font_02_sfnt_off0001138b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes