Malicious PDF — malware analysis report

Static analysis result for SHA-256 9162e07a906519d6…

MALICIOUS

PDF

80.6 KB Created: 2021-08-21 12:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a0c6c55d655857efbab6d09c2b60954 SHA-1: b20936440e9b0f1b1c775eacb50cf81ef38f3ea7 SHA-256: 9162e07a906519d69d887f3c07ba838c1878509b75b11eb2d5ae268acc7ff4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/uplcv?utm_term=how+to+replace+a+toto+toilet+handle PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c3eu2bt1u99s6ljeo6c34d0vo2/14474910874.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/30425647066.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2c88dd035---wefinurefugofa.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021081921121233.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/93063569701.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/gixumadujopiviw.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/9540845213.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/57648742209.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3135aab364969b8a59c95f37d25c5101/delixofijuvinopok.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607893801889b---26335857362.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qq95u0mm7gt7aa71j9mqd4nrk2/92115989314.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/208872fa30fcdefdbb3c5fada2011f23/54183032219.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f77c20c1---wadekufuxiwapadagujonebu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b460134d0e---51697150885.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/63285687276.pdfIn PDF document text
    • http://feast.to/upd_file/pazuxoxolukimabuwipanawu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xezilujudosusixizuf.pdfIn PDF document text
    • http://parfumkin.ru/files/files/43293702328.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8f2a265557f47ca6abc549e64c057c01/rafijatakapozowetomeraze.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/53610596376.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gp21phloe5ul3bkpq08c9j9vlg/zodepalexuvizaka.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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 16192 bytes
SHA-256: 8151b82adfcb8c9bb004ace68e31095d5c959d2b8d13aae448a1ef19424ee68f
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10520 bytes
SHA-256: 9ca96a8530fb747892160613f7e017c704c08a5e9b09454ca4da0946f030217a
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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