Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cb8122fa949220…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 23:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d9c50b00453b50ae488a1676621da15 SHA-1: 507bcff84369af742290b5afbee9dba63b5bea43 SHA-256: 27cb8122fa949220cd8b69e8608096d46eb8f538eb0f3ffe00e788a66fd61102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae21b537c---miradelujokafawarorigi.pdf In PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/hkh73532dppdlo58fr12brqo29/zarebufolirokejerubevid.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/91290076768.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/kemaputozez.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/madunevizejopuzutabuxer.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/gosabazufaruwetazoxo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2c943acd9134f769cbb3d758a98d5e14/rumipepox.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/78c971e465964dd80cb9ab3e7e46d298/vabutiritagowanege.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/xizibulixorofoluzajagazu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5205437e---46592860109.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/dadovewo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nalean2f4nuj7ljluoadfn9ir7/86299210536.pdfIn PDF document text
    • https://salwangurugram.com/files/3441160819.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b47724ade---mazunujonipa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e427c792175e3f5b1e6e140f47d70476/6450857494.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/jepituxoledakovabexe.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b866a44ea---92416213201.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c1c55c8073023238ec4056ad043c466e/2811057336.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/91412704049.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ccab2c71---45915927927.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/domigep.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/didanizipobe.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/zitapakupabaru.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/aa22c75363c3de394c06e51736928caf/gutojivujikogukigen.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/65916765786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=exantema+viral+subito+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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 18708 bytes
SHA-256: 40728565f6de0bfb5b43ed61d1e635deb24f76925d2319d6eec196ab9eac07b0
font_01_sfnt_off00011987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 11052 bytes
SHA-256: 4cbb5b37322596d5e30404361845e50e0c41a22a7fe84f6965b124780b04352f
font_02_sfnt_off00013305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1