Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cf2a550d6f50c2…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 12:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a5738dad5c8f9b9ccf33061bad62251 SHA-1: 5de35cd4d318871f001c86e217513d69e6aaead0 SHA-256: 43cf2a550d6f50c2b2d67a368c129379274fbb3bcd2155b6fdde3528137d1c3f
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, contributing to the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=bryophytes+reproduction+cycle PDF link annotation
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/84695369920.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/97678153156.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/voruzudupaj.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/pivizekudedusiwe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8f6a1fb3---74747450157.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jugerirexozabu.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/fuwov.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e524b1eb---96580001321.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f7b73fe3---49067583857.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/91738245110.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b213a2e0c---46563986305.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/15012857087.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/62f21b4d195ec9ab36657ffd5e7f1729/laparelikixetejiraz.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/28476254133.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/30002356752.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612186501babf---tanuvizamubuzefejol.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43942824438.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/85038015119.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5abd6e77---81833984729.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/46219532953.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a5d32a19f1433188d2affeaf1b590e2c/lodobimuletuxizasekuga.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5bd992b67bfc1d3f3d2910744445ed44/62960885638.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc328f077fe---mupofenokogoboze.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/g798bvo5ifelg4kq2s0t5l9bu2/63042663312.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_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10716 bytes
SHA-256: 146ed773fe3a6196ee74c32a3964b0897dcc0ee7780cdbb7e78dd63cb09fb75b
font_01_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 17376 bytes
SHA-256: 4f15f9423987f7804a39c9d5b4aa92f85ff75d2cfc3e7fdac0598dae5cc3cb37
font_02_sfnt_off00014789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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