Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1d494bf467624b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 13:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 212b4c19f90f7a4a7828b8e8dc62e7ac SHA-1: 6fbf0d5aead2a406e7d4972cddedd8c877154ae5 SHA-256: bb1d494bf467624bd83304e10af1c13838d7563d20ebde2b7d273021df2b5dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=calcium+carbonate+vitamin+d3+davis+pdf PDF link annotation
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8368a0619636755c20668c91d05ca6bb/voxitetonin.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210831_000902.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/4t4svuabi0gbi97jt0mulm36e2/zegedupovofevisosobutil.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/salisojadasedowukoti.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a2e6198c8af36108f4f8919b729c2cbc/buwuzunuxobuzatazabutik.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6608b7021---zituxunigabo.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/vujugotoxeselimate.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/006555f5849d640a4840d0081e25c8f1/bosigomuv.pdfIn PDF document text
    • https://rintrans.com/files/88449595077.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5f102e46---84123734013.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091637f76771---79634509595.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2c414bd7b---42964367697.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/80323648035.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/nifukosidov.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/luwupovidekajose.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7878cb7366---jivopogu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1302e28cb2---jefala.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r3qdqj8hd5a79lhrsgm17eu4ve/nukelabewugikojes.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/sejupexikeru.pdfIn PDF document text
    • https://kimcert.net/E/file/mitesi.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/gokogamosegomapasowig.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/gixifi.pdfIn PDF document text
    • 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 19608 bytes
SHA-256: 70d66aed77bbdb24261d451acb222e89351507c26b46214edae1f8a0d46f9065
font_02_sfnt_off00012ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE9 11288 bytes
SHA-256: 0eb1053a58d864444c640eff3859c47c45d5000373a44d900b740cc6faf9ef6a

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