Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b569ad988617983…

MALICIOUS

PDF

98.8 KB Created: 2021-08-09 15:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ab61fd23593cba5b37a6e570551cca8 SHA-1: d94c8080bcbac89e9bbb1c64956f7a413cd304db SHA-256: 6b569ad9886179832a81ac4db6996093450f97b1b6ba21dd7aaa936b84d73a7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dobraukraina.org/sites/all/sites/dobraukraina.org/files/tokakitawebem.pdf In PDF document text
    • http://huichem.com/ckfinder/userfiles/files/7725655334.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/letojufedotutevize.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f64efc4c---69122567930.pdfIn PDF document text
    • http://air-con.ru/upload/files/falisuzabuzelinufiza.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4570af761---744955403.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fiwunub.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/nepagezuduzo.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/xijoxakigogikafewuk.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf801a48bb---91165442574.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5i5cc6kcgen4go3n2vg1ovbkf4/81706268454.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/matuzeja.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6df8a284ae42f3c39e0a1980ffc31802/93790148356.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/duboxidopetafelug.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/tonudukiwojewisiweto.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f80ca0ee1c22b6f829780314c1f8d7e8/niwokowiwajogavafo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/h3mp81oood5fsfrd2n1kf1smjo/noxagunivodivosanuriju.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/dotefabegumajipodikudukor.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160985c6a2182c---98407201388.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/47553684293.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607447778aa71---39421538908.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4d440d240b1d8580825c77d3a9154fb2/limalolujivesijuguwumob.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/80652356710.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/631818ada1220e2231071ad59e91b5fd/90187085617.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160973382e8dc1---28446599675.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/18598224273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=whatsapp+messenger+apk+linkPDF 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_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 10664 bytes
SHA-256: aaff25fa318d81121a3a4d96a8a0977aa35cf2de50ef3ce004dc1be5af74f607
font_01_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 18064 bytes
SHA-256: 9d5e68e711bf328ef425f158c56dfce734737212f255eab570b536aab33c084c
font_02_sfnt_off00016559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1