Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2159ec08b0a1bbc…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 07:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dd2f47e4a071c5db3c3cd4de13f82a5 SHA-1: 05cea3b1638a6f3ce1fedc8333bc97bf844fe8eb SHA-256: f2159ec08b0a1bbcfea5cffcbbacdc502ef58a6fb556d6a6928583e64b12098a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=watch+movies+free+online+with+friends
    • http://jmk.kr/ckfinder/userfiles/files/19799343440.pdf
    • https://tivirtual.com/userfiles/file/5604243065.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/pemilanujafotim.pdf
    • http://immodraft.eu/images/architekten_agentur_images_/file/59327481683.pdf
    • http://webspace.mysdam.net/images/newsletter/files/91001407160.pdf
    • https://indiachristian.org/uploads/files/50033167857.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tawaxame.pdf
    • http://czechdidgeridoo.com/admin/upload/file/tagudawujaxijev.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149340915d2e---nugesaguwavimumeneboso.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6mt120bvn4rh87q45so2uklgnd/relizu.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422f4eb88f2---86471269028.pdf
    • http://birizgardenhotel.com/userfiles/file/liporepogulemegaguj.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/jejap.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d5449fb274feddd9ee3f6b97c306348b/rodebodunujisinewiviziso.pdf
    • https://domilot.com/uploader/files/nexuwowelabowani.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613774ff7c988---lebakunabosopat.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416dbb5c275---mewisub.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/36977679692.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/77420124990.pdf
    • https://megacook.pt/site/upload/file/86738357007.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3afba306afec405355d6c997d42e3c12/babugejajozopirakuluru.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ecc363ee4---93441929664.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 16792 bytes
font_01_sfnt_off0000c72f.bin
3100776c4c36098025f3c355b086444d260f8054f18e5c5d64272ade76e57459
pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 10884 bytes
font_02_sfnt_off0000e03f.bin
615fba3df7c9a055ba93ea0cfebc7183f402d9cdb6768bef64f82473bb78947b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 14588 bytes