Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4bee19bc42c9fc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 00:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbe9e4302e9e697e2f7740b063c9fed0 SHA-1: 4a3e35e2c682745ae9ce84a44d74c0b05a97f6bb SHA-256: 6c4bee19bc42c9fc8bc05ee3f112992974b79ec743850d3c51bc972f17f1fc35
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, presenting a link farm hosted on multiple compromised websites to trick users into downloading a password-protected archive. The presence of multiple PDF link farm heuristics and a ClamAV detection strongly indicates malicious intent, likely to bypass gateway security by encrypting the final payload. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=the+linguistic+relativity+hypothesis+states+that PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2ed8300d0404994ad3a8575f7c8e93dc/46538569482.pdfIn PDF document text
    • https://schmitz.cz/res/file/90076134402.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160764c8eca943---30056449361.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/jadinoxuwuwor.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098332305b1e---fugagaluwafadufajam.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d73022e2a05---wagawusev.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/dikisu.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/4a3db3601b7157876b5f7a878137d767/39907733518.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/77662207629.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/kisovobopovikuwepujek.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/54957743625.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wulaz.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/23745288280.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/winuxugesavujezatixag.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/jamulibeku.pdfIn PDF document text
    • http://hncastlecable.com/d/files/28922630988.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/fomudikapegubuwowida.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/23b03cd5e0461dbc970dcb1b8172b1bd/46407091880.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89cf4dfaed---kufupalufa.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/mofivu.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/pejugajuviluzowu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/jaretisi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a10c54caf---14235208251.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/xiropopojafajopibafo.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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 18096 bytes
SHA-256: f8af3f5028b8789bdd9fe23bc211cfe2f044a41b406a5704f0a7b327ad746c52
font_01_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 10896 bytes
SHA-256: 13e0e8d9de3cefbea2c5745245fcbdcef6213776a9d42b42934be9341606bc55

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