Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a87675eb789510…

MALICIOUS

PDF

100.8 KB Created: 2021-07-09 23:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2779d94d571eb15c98191b9e9ff9a187 SHA-1: 5c318b69d2bc0462ec2c9cc75cc33bd9678d5071 SHA-256: 12a87675eb7895100e51ac039b5df893dfaf11b250a1e090448102381005afa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing campaign. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into downloading it, likely by impersonating an invoice or payment request. No scripts were extracted, but the presence of numerous external URLs indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=a+group+of+eagles+is+called PDF link annotation
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3986a800a6bad27aa9f39d4861d6bfe6/fetef.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5vnflfh7erss05va9pv9gjfqpp/namefedogopoponifeza.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/gagutumisivitosalizis.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3572c3bb7e---33546219542.pdfIn PDF document text
    • http://yilip.net/userData/board/file/82656080534.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7264320246.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fcb9d407229da21e2731659f0d88d3ac/7099383659.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vunezelotemapepapuv.pdfIn PDF document text
    • http://www.bash.cl/media/file/76557706595.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/96088908954.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/paxalel.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/67848286762.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c2a6b906---jupupidukepabuko.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a838cdb8---donipagazej.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f42d7766---15329535471.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7bf57320ea9dd72524de587d43ad93e1/zifovupawutuzoliw.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3790e379---pikelawanipirugud.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0og4gaoniut954ku406hs94ia2/vokerudaga.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/rugevizinomimib.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/72015325371.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d272017c599---78212261316.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecfd88746a---75197736035.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 17544 bytes
SHA-256: 4b1acea8badabbd46a04dd61bb9281f6235119b25bec85351c46a4f684dd4ed3
font_01_sfnt_off00015594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAB 10676 bytes
SHA-256: e96abf23f8caf175bfcba449af025a1cd994692c15e529a4c9c9a84f13e67681

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