Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbf68277ce0b018…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 16:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: accab91daeffb7f3883fa17b97e47c5e SHA-1: d062229e438773e76ba1814c43b3dfdd22362b51 SHA-256: 6cbf68277ce0b018bd73c5d2070181f80cdd0f2eecb4de9514181bf45e60a2ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://highendschmiede.de/highendfiles/file/42689618229.pdf In PDF document text
    • http://noithatsah.com/webroot/img/files/94900407578.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/rewunevazolujifa.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d7b271552---52564697759.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3a036c25---dojirafijero.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/67156382019.pdfIn PDF document text
    • http://africareview.in/userfiles/file/jinekenumifireg.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/ravavodaputopaxosova.pdfIn PDF document text
    • https://clove7.com/userfiles/file/majopibomalalevenu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/75449594760.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/foruguno.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/63192761032.pdfIn PDF document text
    • http://www.520amis.com/upload/files/64729997794.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/94545748732.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6100426d06d9f.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5fa51f48---17616915631.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f3f5f1b4e---84653982340.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021775146.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/xexoruzukosurozi.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/57081592911.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ajpjlvlehso6tajl7la8mfmvi6/55162943976.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/beb3213d51ceb448725dede03da009c1/nuzatoreduvibafelotexis.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/vokigopi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1566c2b7---59700917815.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c60ec1610073f54d0c0ceee2ed4ccf5d/71888757944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dr+faustus+full+book+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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 18088 bytes
SHA-256: c99a3dac710c1a9544cdf71b70ce99a9317ae8a13fcec625425dea613870a0ad
font_01_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D23 10496 bytes
SHA-256: 1818aa5d42a5c5c11c230b3e09659ecbcc3a0ed68f1d94418dcd77a43a74c5e7