Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff6dda915fbb890…

MALICIOUS

PDF

77.7 KB Created: 2021-10-02 19:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aa91eb462047beb73511817fddd1da5 SHA-1: 935afa9772b73a922aa1e9b1d1a076dab25ff655 SHA-256: bff6dda915fbb8907cb5e0e2f2fc99bb1e709bd3b69ae1ae0555494fe01a4229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://dealershop.es/camarasegovia/userfiles/file/wivezavugidijiwa.pdf In PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/paxupesusufovuxazeji.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/46843084039.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/90155509751.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/40143293384.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/4626181494.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/xuzaxilufore.pdfIn PDF document text
    • https://majubesar.com/contents/files/rurosifibuxisemenileki.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615071336afda---6614988905.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/77286710764.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sotug.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e17779040c0515866b479ae21f1eeb2d/86579492679.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/21157893808.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/zigiguk.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cbf325vo0tqgtfoe2jl3fkf7k9/85479249309.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543ba5288d3---mezizupifejaxujixode.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f31854a76d---90769839429.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gaxopekisijixuvijijaroj.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/99405b2954c1b17ee11b4f2b19a6efcc/zesezafilux.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/60597275535.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614edb1bee8c1---gebewejafatikebibix.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/36324674518.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sewoso.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/9628274219.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8281294551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=history+of+gond+artPDF 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_off0000c33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 20764 bytes
SHA-256: 48e26cb2c861fe30cb37fbe88cfe1c4659d67d867812e29e0079ef027fe54576
font_02_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 10456 bytes
SHA-256: f31e10d62a9b20f3af987b60335a4a7845324d387a935e2a9ec19fc49963b5f3