Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc64ec8389415ad6…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 00:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db03f3e5723b79c2566f7c0d97cf1ac3 SHA-1: 510c59e802321055236ef3c3b871f32b3d857101 SHA-256: fc64ec8389415ad6cde59e75116d7af43b2dce9b64858785c1f5c28c8d185b8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160814aaf997f5---50570060039.pdf In PDF document text
    • http://homestationrealty.com/userfiles/files/zamudapejevoroxasidobe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a5be8620---7819492253.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8221319f---lazidamalabakaw.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/rarumafogepulelinudazoda.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f12qhlis6242f0iujctnq098dg/89571890213.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2c01fa635b2f581dea8a482e039694e3/91109666215.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/68736340380.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502193053.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/4322901946.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/voxaraxoxotojugujibixili.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb776bb57---wovozutisawifivokitofej.pdfIn PDF document text
    • https://mahae.hu/files/files/63418719607.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/gonekaxosazinalek.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/31408349474.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/03dfa48caefea52ad30f6cc0f19065f1/2469291183.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/gozejejipokezusazenarufil.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086a50c7bac7---83121194668.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/tasomosufi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0ef263d0e2a6f3d083d91f00beb9f4cf/3875109796.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/4776078630.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/h68tmov1icnpo7dj3804fo8mp1/taxokeruperejeg.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d7951606---kepiwilobobatasujaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=descargar+sims+1+utorrentPDF 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_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 17880 bytes
SHA-256: fec2385497a6f87e149b4ee969f230421a745f595b1ce2b5e09fbe53b6f32b04
font_01_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 10680 bytes
SHA-256: 0ac3c8a9544257b9aae65b0a408a5debccf7c53b3be22f6506e3e00ca40291de
font_02_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1