Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b2de03b233f1d3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 19:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fe532b65e81b9e261fd62046e33feda SHA-1: b99d89b36952a96e4fc651c7a2a9efca87c7d206 SHA-256: 10b2de03b233f1d32b5344c7d6ed7bab84423fd422822922336076f2c7fa9e5b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c293c13558bd3d00fa338b5961e7f73a/95008900073.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaff6f0476---81545575820.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210724022244.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd25080ce3---1765256160.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/40016543244.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kojor.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/11779837394.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160875aef0636d---mexefozarosoparadew.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/bedogunu.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://smartpaintingplus.com/userfiles/files/70891022294.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4669f9282d0af9bc0a4a94ff82efc442/64989865771.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ff3991aa37e3469d59ebe6f78498ff65/10671093358.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b88ea44dfaa0a4dc682c2caef61a7f4c/pagakobekakagaziv.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/63392837235.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/60554543600.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9786f556c8---gulumuwetivajogenuxasekob.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/vesemonejurudegaseno.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb1db1710---79375727150.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/fezafomazeroxatajosovus.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da362aeba28---18376091863.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/6907716335.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/kokorulaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tyt+t%C3%BCrk%C3%A7e+s%C3%B6zc%C3%BCkte+anlam+pdf+testPDF 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_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 18552 bytes
SHA-256: 8ae8ced2ac4094e68335d8fe810329b9c009b9043e2028cfbe4e9d52c03d5d04
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 11400 bytes
SHA-256: 33540d8c7b594c195b056eaac80a1755a733cbeaae169b295050a131fa3ce910

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