Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9e849d6fa9f198…

MALICIOUS

PDF

80.8 KB Created: 2021-10-06 04:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 11c5cd1fd4146e44847e12ffc6bcb5f2 SHA-1: 3cc19e518bffa073b10a54983367a88c6b629994 SHA-256: ac9e849d6fa9f198f3c0b288f14ffad7237cb8ddf2f1451b82c6f66ec572b838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links. The presence of these links indicates an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=g35+coupe+2010 PDF link annotation
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5825996acaac2abbea868269676e29ce/13320243178.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/soruder.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/zudipopezodavisudaf.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/58208318213.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/luvinavizixibede.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/51188231521.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/90702381596.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/79814932278.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/14467803650.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nijizuvitupado.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/51301411369.pdfIn PDF document text
    • http://toroisg.com/public/images/files/jopanaxupakusu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/kujixugulapip.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/valenopejuvezajan.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/lojewanukixeremosowowuma.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/govodukuzeji.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4snflpil5u3fd0haaavhilof61/nokofituvududunawiwir.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/nelixijidoxaxuzeme.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/94322191262.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/wakolumod.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/fevamosapadefopi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870efc8c25---22245011176.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/dulatuxidisudogedi.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/28537730919.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_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 19508 bytes
SHA-256: 53e2b58cdb30e0a0acb3b9c7e34443a377dbeb6fa9f35cb280d7c03cab2eefa7
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 10336 bytes
SHA-256: 7b1f17a8afb3ec248d9e7e149c19d09bbba13b3e9eb8e90321e82f69524fb704
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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