Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b88766a9e9049b…

MALICIOUS

PDF

88.8 KB Created: 2021-08-05 16:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3230635ac9d5c3a5d8726d8d1c4e58e2 SHA-1: 51908e1e0faf732b3809d4244911f23dc889c64c SHA-256: 64b88766a9e9049b13f500f279e6caed23e9e2d9feefe7eff4166d873fd0a86b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jxloanchien.com/style/postimage/file/91472021127.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/bufovafifijigasilibipuni.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01a35361b---76360857403.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/66216624394.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4cjpovkf7uc5pkbko0tffvq26d/wokabipukodope.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b5df94acbe1d212b9265da5743fecd3b/zagajomebisukapelofaw.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/294c4ca71b4d30db7b9dde81abfc4458/defitu.pdfIn PDF document text
    • https://dm288.com/slicice/file/dabawox.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed4ab0933---40564734354.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/178b8fe90dd94be8b13ee90e219eaabf/15373002045.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vivebunataxo.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/3518788415.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/72226205003.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e9882cd---nosuxu.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcc892ee8---93924907641.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e831d4c42---66916807734.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210624_166280CB4D6A77F4.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/wanurutawazap.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/mezifuzitonagasoxobemaseg.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/sisonapojamonimiboriwajex.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/ralaviveludotu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kekivinorovixatavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=who+is+the+richest+man+in+the+world+february+2021PDF link annotation
    • 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_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 17592 bytes
SHA-256: 04446f3464e33a8a8c1c612d14d1e4f30402502c47c5a2cc2567337e0b2c9b7f
font_01_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 11468 bytes
SHA-256: 8b515db05445c851f753264ab17f4a18f70a5761a7b55a8ef3575b42ae326a04
font_02_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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