Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a0cbee00b90f20…

MALICIOUS

PDF

203.6 KB Created: 2021-06-28 11:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0562ddb9a7648d554bf5faddf6769af2 SHA-1: 78eb2f5755accaa831bf4f608c6e9523d4b39dc1 SHA-256: b7a0cbee00b90f20a46de2408a23c20145811016837487b3c5d8177e43cc7fe1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, and a high-severity heuristic indicates it's an SEO redirector for a free-download phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing document or exploit. The embedded URL 'https://coretry.ru/uplcv?utm_term=secular+rationalism+meaning' is a key indicator of the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://coretry.ru/uplcv?utm_term=secular+rationalism+meaning PDF link annotation
    • http://adabaskimerkezi.com/upload/file/visonarokoredupizudafubul.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/3352747933.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2fc6ba78afb8bfa48f1d4977752a8bb8/doxivoribuki.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xofakegumalumilavomimizaw.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d83867e4---jufitelelisepewa.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/tetijadilebazaxebetisizem.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2e8755cae7ab193ceb2fc8064a956dc2/sekamuninosafeba.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4e388a007d173c1d17c88f8ef0302bfd/7680516455.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/67948006181.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d87f1971---29256671229.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/afd9tqorr5tu0cstgbvm4pndd5/46147930671.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lasewugikusu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1eaba1ac---tadugosogepobusibejen.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098604fc3461---tatidadejoxafes.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/64612974904.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/nugatelifox.pdfIn PDF document text
    • http://balone.net/_upload/file///72839573670.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cfce18571f1e9b6c2c0cd63f63b1911a/pavolukeluroga.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/wajajaxuriwefazazan.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a591373ce20---70706411549.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9180553a---30758032422.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/62729388856.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/vijiwevixugukejekovef.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/mizaralepamegaxuziwogew.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_off0002bac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAC1 21460 bytes
SHA-256: dcef4b1445836c0c1b08fa17a5f495bc08cee9ff8ae6790264d41138e12c837c
font_01_sfnt_off0002ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF9F 10748 bytes
SHA-256: 9e7b15cc55ca149032f4098cc2401124a533d0619cec3b4551057ef509b9ddc0
font_02_sfnt_off0003084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3084E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1