Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59155095621109c…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 04:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e69526ca9cb52496468b8d8074bf9d5 SHA-1: 707b10be859e39ef7670891eaff154b1783ebf77 SHA-256: b59155095621109c8c9bcb78346e478ca92ee5e148bbfdd943817c56d612b06a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=twonline+taxwise+2015 PDF link annotation
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/gafujise.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/96745170178.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/acf9aa85f978d18e261d1688792dc689/bidemevobibolajikibub.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/274361624.pdfIn PDF document text
    • https://samowar.me/userfiles/files/bavadufalig.pdfIn PDF document text
    • http://geose.ru/userfiles/file/42650848936.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c577cb2ead9869dcef039611f925cca5/99624983655.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160853b274777f---mebevapavir.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e3f8c6989dc43415554ff26aa600d925/xefugorato.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/tolij.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/od074u3aj8a8ojod1s9a551p51/46737389403.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/figovutidowijekun.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079075a87230---62305703069.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/16255276618.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c49d173c31df1292e5c5cdae91abbe5e/xolimutatanidol.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c14c2b49432ea6ac9e261ab69e697290/sujopojuzoxadozo.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/51181264859.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/34359201792.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/2671387160.pdfIn PDF document text
    • http://midel.me/userfiles/file/jivexatogedaw.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0500fbf912bb0c1aafe524ebfdb7bf12/71514797498.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893e210a701---54739550747.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/tegotefularizulevotugibu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/103da05a156d8613bf3b0d10ff462cc1/38993519883.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/gogadefarufupufenapetuvo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc45c8a823c---wunewu.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/7441304490.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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 10580 bytes
SHA-256: 8515bf009c5f3774005713e137e6f4ec41ce9ec3f71419c7b738e20afcd02745
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 18136 bytes
SHA-256: 7df7cc65cdc07646e5ff3bebe60a94fbcad90f838e68bb4b1663d6ffe9cef535

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