Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffb6ac2a488db7a…

MALICIOUS

PDF

126.5 KB Created: 2021-06-10 05:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ba76d3621bb484eaa616c87898e9235c SHA-1: a3bcd9c710eb98a16131af6cfad31abe64744920 SHA-256: 9ffb6ac2a488db7a316faf91bf8fdc3a4b10a660886632e7a03814aeadc0c1d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=god+of+war+2+in+ppsspp PDF link annotation
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b7e79d8a---xexazakuriril.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/31282b08403e909a3dfcd144d26801a8/pizozusij.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/36222027197.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7d293f48---gupupopudurixodemako.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/60150661744.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/dafopotujuzew.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ae0d1c40c1f9d0744a7f004e5685ccd4/fabapuvu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b238ac3d4cc---jobakumuzudoradixo.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/98214240551.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8162bfa7e---sesubevitorokoralivuxuliw.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe3bd14db---21131741435.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/xuzubejo.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/kasinitaw.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993377c2637---2289003739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17793 6036 bytes
SHA-256: b8e3d9f92d7159e71872836d97dcf03ea6ea94b2e726d9b8bb3161c0bc56ca62
font_01_sfnt_off00018c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C31 4848 bytes
SHA-256: 2f81e6d3f106da9e2fef8f9c2c0af9253c6c90f684aa4ef3b3da648582180bf2
font_02_sfnt_off00019cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC4 11396 bytes
SHA-256: 0014b2d334ac62eaee03b3aec3b82306bcc9ddc0091f7e57f9a1647289ef3e33
font_03_sfnt_off0001c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C350 17112 bytes
SHA-256: 436829979245b7126098886beec731c3e32f79caaa22165f5cf5bd484c81a714
font_04_sfnt_off0001dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBB5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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