Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c85935d9d0efb0b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 16:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34084860065936bf1e0e2b060dc44007 SHA-1: 9efa14bff6521d5a954d87159bd8fde7b93c3be2 SHA-256: 8c85935d9d0efb0b4c5f0e245664365e54c07a3274666c2e90e69df6b3363654
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is used to distribute phishing content or further malware. The document body is unreadable, but the presence of multiple external URIs and the link farm heuristic strongly suggest a malicious redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://wastran.ru/uplcv?utm_term=international+tv+channels+live+streaming+free
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db1ca0d98---4053121410.pdf
    • http://daimarconstrucciones.com/images/admin/file/692195579.pdf
    • http://brmxn.com/userfiles/file/20210910124256_forge5.pdf
    • http://mrhobbscoffee.com/images/uploads/file/57141418663.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613343caf2cca---fovuso.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lfenq89cmomfc3lb9m9rlnvumg/99242895872.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/mazemebepomemenit.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/371264d10afea1947cbb4c8f06d704ff/koronup.pdf
    • http://forma8.kz/ckfinder/userfiles/files/29364951754.pdf
    • http://stylekd.ru/files/8094325457.pdf
    • http://confidenzacsapagy.hu/upload/novefofumujoduxebaxuza.pdf
    • https://hnhaa.com/userfiles/tnejp/files/50722033755.pdf
    • http://hzzxtl.com/UploadFile/file/20210906204714827.pdf
    • https://healthmatters.me/userfiles/file/zobex.pdf
    • https://eltdb.com/UserFiles/files/liseluvitita.pdf
    • https://mttrasportisrl.it/dati/upload/file/vujodiginabebibufakaki.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/torovonawirakur.pdf
    • http://ogledalata.bg/uploads/pages/files/9478631031.pdf
    • http://aczelzalog.hu/tmp/35036996850.pdf
    • http://rancholasmonturaspremios.com/campannas/file/rimizotikividetolavife.pdf
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/levefuvimoladitel.pdf
    • http://mutamobilya.com/images_upload/files/3853872516.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/38087410699.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/75150532268.pdf
    • 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_off0000b116.bin
1994f43b2b4dfd5b1688410f1f997f14bc340d4f989ce603d55aec743cad6966
pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 17548 bytes
font_01_sfnt_off0000de90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 16792 bytes
font_02_sfnt_off0000f6a7.bin
6ecef07f7191a6d1f434adc264247de4679de237e0f82d68c91d0ec0b331d117
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10800 bytes