Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e3c01a3604b760…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 21:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21a88bf42301c9d17393eceba199d05d SHA-1: 2f833f6e01007f470b4420c925466905adda60b8 SHA-256: d9e3c01a3604b7601205eb02760c83cefcfb6362a7624a2253430de5d2bba711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://garglob.ru/uplcv?utm_term=maths+formulas+for+class+12+pdf+download PDF link annotation
    • https://bamor.org/userfiles/file/vaxoxe.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/60991516729.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109f53c474---zonalikateku.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/64609719644.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kiwatonowarisufari.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n18h89h269pem5b56qeh880aj5/833612873.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613148b9c2f73---67669809051.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6b227b0f8---63473654310.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zubojozeju.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/44010180822.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/51fc7b606b7ef05105457d19ae775eb5/waruwuleba.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/relabi.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/38172302669.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/fusorabumi.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210612_EED45486C27F23B3.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072968134fa6---nesazitobobodi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/6174309932.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/mozufonoletaj.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/xuvuraxakonegorujufofuxog.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e2398f2e857a83bc1074defe17a1119d/wikisanowujed.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zevuk.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7390e4c8---tagusuva.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 19220 bytes
SHA-256: 86a76471f4a63d654e3830197d53e347c10f64325f6392dd8bd1ce3271b92149
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 11012 bytes
SHA-256: 8445d0c00e5e889cf85c4ea2fddc157612f4e9029145468c12c97447349fad5f

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