Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93b235ba6b9e251…

MALICIOUS

PDF

97.6 KB Created: 2021-06-26 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1acf68f75dbb5ad9ab66a27ec6243833 SHA-1: 84e933a2e14b2c06a7a6cf6bb08ff7be87f8f499 SHA-256: a93b235ba6b9e251301256543d0bf9bd3a43457a4f68273aad34fb74980bf4f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef13f719981c61e13b0f16a7c362f95d/86028619392.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/msnr4u5uj2j6j4ll5nfpdq7381/nabivoxobutapefejiwam.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/delilozuwavivizipepadasa.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/72144063376.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/6094552972.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efab6bc1e---safewoz.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/tepuvedigariraduselo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f3dd5d12c---bodujolevipiwu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/9vaf3h7h40rlgavjn3c0kq77rd/vujipinavetovutelujisa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078382763819---13134631084.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/96496782476.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/nexibuzopufo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26725b2297---18477801732.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f7d02e4ad5ed1140bb5198fec9217d92/37330030803.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gs36d7vlejji7b0m8mopsc40c6/4144780790.pdfIn PDF document text
    • https://go2germany.ru/files/file/74102784242.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a46c88f8d---jetegom.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0fa54709b7c5d43856283985b4ea6ccf/volefujenito.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a8692416---memopitorejizabor.pdfIn PDF document text
    • http://abpaluso.com/upload/file/43112890150.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/65e2f8a9a04a591afa71f91d560f97f1/98926090991.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1b1a590fa8f0eda20848e5f03eb70880/wubivativifovad.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b04c18217e48dcb232432689914bea3b/gajatuvadogap.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e37f6ad713fb099155c92e86681a2ab/63245550931.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7b8d32a95---46219243811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+bastion+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 10524 bytes
SHA-256: e61253ab1c3da40405555384efd69973eec36d926d27e70cfca7322e94b0a914
font_01_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 2372 bytes
SHA-256: 35be810ff754ef130275823e065eabdcb7fe0ba134d24ad0c37794b983c527f3
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 16736 bytes
SHA-256: 5d51fb00f0c4c02d965f1674aab2618aacc03e5ea2fe66477d54b3ead4dbbe9a
font_03_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 21812 bytes
SHA-256: fa53790a3473bae04d11ed951d510099bcade8dac34ce9d4cf6b34a3dfd60c60
font_04_sfnt_off00015e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1