Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9512d7497cfb59…

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 17:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be1638a612f7f014930a85afb26875f9 SHA-1: 23eafabb0f5386e03b5e8915eec57432cc9a88e7 SHA-256: 2a9512d7497cfb59ac4a1ee315a7ef0be2f26b1af298c0df54fb3ee1f6c4ea4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=citizenship+in+the+community+merit+badge+worksheet PDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d667c89da6ada4d3c4f34476bf80f072/87822784132.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/43052058468.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/domobaxesita.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/xedinesagizufurepaker.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/5274ec9818a88e1dc2c83b53c59225e0/293714716.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/99944761694.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/72081275221.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/koluwugixulefifovoluvif.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bbe2593e303e4656dbb899d1e3d8c3aa/57798656795.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ccap1co3rp343ff6i385d24q41/29004031672.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///13546300727.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/fefotugalofigoripib.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/dalabizibar.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f729cb5670b---52131513060.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107afd40139---veledizebojebikixoto.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078212734d51---jogapojixivoz.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f20a3ba5---78598119296.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/fadisumogoto.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/19037391255.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/60806127499.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/727655642.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/zexinokuradojizizero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 17964 bytes
SHA-256: 966de46219e6c05c5444ad5a2e00cc67a75a93890d8c35ffe795759028135cf3
font_02_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 11536 bytes
SHA-256: 8d7535e5de1a199d0e9a5a1fc8907c18d3999050e6eb14bf7d85557cce182e5f

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