Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5672d00600c04d…

MALICIOUS

PDF

92.2 KB Created: 2021-08-01 05:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef6b66a18241b2f1d5d86fe6f01f6711 SHA-1: d9b6da3862d49fbc4b0253d117593c71f7168cb2 SHA-256: 5a5672d00600c04d42320b4194fb60b6e8da30914279ac02c81166a8767e4e4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many pointing to compromised WordPress sites, and a heuristic indicating a link farm. The presence of a 'download' button lure suggests an attempt to trick the user into downloading a payload. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=equipment+specification+data+sheet+template PDF link annotation
    • https://tecnibat.net/uploads/archivos/69036114233.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a021c46b00d---68332094857.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/ab52a59701d321f5142e6403dcabde2e/kokejikosugexetasamusuto.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff45424de---85979368541.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/74187095215.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d14292ca99c468caadc5cbff1abc7a68/belasimokugegojiriluzajo.pdfIn PDF document text
    • http://bayihoki99.com/contents//files/bolenadeb.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317acc3187---sibabikirojuvop.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/48641037163.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/87394574422.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609601c1a497a---luguvimiwuxoxopobenala.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8eb67b5c0dd3d13057c55c78f9f13e5e/nivavefisudi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed65cb1f95---69012783304.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/omr9qaiuhhjc93md72akepfg37/32552328130.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9e2mp5q1ad477da3lla8d3vc9e/jutarosomafuwafato.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/guonvf86hlu7m3cg24jhrctl15/gesuguwedebi.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/takokatepazetuxulafidi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104dec65c2bb---pazigelut.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/73432882782.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nujigamamuf.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/46495503076.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wanevuniterobonuborisugu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0b6497101010eb09b67114904acd157c/37816117432.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160922c9647a25---jogar.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/27332724466.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a863461c900---ranazukiromawixuwezowibu.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_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 16920 bytes
SHA-256: 3d5a8cf3af3cb9f8738a4f1e09cd0ef03e03621b03423b8e2b59a993a3cb9012
font_01_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 11012 bytes
SHA-256: 5a73352569c99d1b52acc09ca2fbdb1b8996b1e4cb33de2d220a9247d9c68157
font_02_sfnt_off000149d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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