Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bbe805ce19d68a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 02:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b10574132daf5fb98b8a80228d85ff18 SHA-1: 0faad1df74c99521b5c954130ac64ccb5e7134dd SHA-256: f9bbe805ce19d68a022822ec0569535c461f61045573822ba46af2ec796cff9f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised upload links and link farm heuristics points towards an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160819cb65c562---18883783850.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ledesoxulujigoki.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d97325f7b0dc6312ff9ddcd40ceeff4d/ximutuwo.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/jejufosolujugojikatud.pdfIn PDF document text
    • http://chinazzjx.com/d/files/siduzewelok.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tejof.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jufanelel.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/nefodabezukujori.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/82406648925.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e506f1527e4---13203556622.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/eb8806d5594c4469f6a60edeb850c9b8/berud.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/wodewikuzekubejetatome.pdfIn PDF document text
    • https://airbays.com/userfiles/file/jomujepatimafodavafo.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/8347850996.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wezewab.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa524e893a---sotazemevisewukupofef.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c29b2dac---xomelosa.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/50969116158.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/tividewulagojozi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bac9be6b1---47313993632.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/garamogizeba.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/23443202243.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/wuboreveguji.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/3625090238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=maze+runner+death+cure+page+250PDF 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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 19156 bytes
SHA-256: 87ba6d26b4bdde0706fbd901554fd2966f8e3137b093feb5f55ca433c2ad1819
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 10896 bytes
SHA-256: c9a344fcbe667ceddddb5c8dca36ca645d3c150f9d9743111f73345119cad1af

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