Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd92736048ad305…

MALICIOUS

PDF

98.4 KB Created: 2021-09-04 23:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b489e451f05044028d5b356ea9e70ea SHA-1: 956070d6524fbef44378e914cb42be55e6ee8f39 SHA-256: dcd92736048ad3056674abee957eb2d85e0e81014a69b772fad5f0b96ff6114c
132 Risk Score

Malware Insights

The sample is a PDF containing embedded JavaScript, which is often used to obfuscate malicious content or redirect users. Heuristics indicate the PDF acts as a link farm, pointing to numerous compromised websites, specifically targeting WordPress upload storage. These links likely lead to the download of further malicious documents, as suggested by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2536

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.
  • 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
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae816ca4b---papaxukip.pdf In PDF document text
    • http://shipsupply.ru/userfiles/files/salixabamukatofefiwo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b270912b2---vofawadowagig.pdfIn PDF document text
    • http://qca.ch/userfiles/file/tapijedolofo.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/gufamukepegagopobeniwavi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/dedojegamax.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a189059d1---3981472637.pdfIn PDF document text
    • http://rubensova16.cz/files/file/vixodoxug.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49da7b55a---25680986985.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/81854533817.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/pobuzokipil.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/vokibofokufezozat.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/76a7e14953e1bc8783a81e810a745f28/65375131284.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74bdd815b---lelujozavafepemat.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8a14f5111a47260f9d64a03ef692c583/64441976559.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/82968453341.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9b68619e---wugif.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/167bbfe0491751bdb732a69c321c3940/63023441660.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/v12liba17koscdeg73lr2iiaag/sonevanoxojelopudinovexi.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/situxupa.pdfIn PDF document text
    • http://techbis.pl/files/file/78975975314.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/zubawupu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/95772425856.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/zesaliju.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/25458139423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=encyclopaedia+of+islam+first+edition+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16520 bytes
SHA-256: 34b21e50de71116a673f5192142275fb065d82651cd185a11b6e39f8f8f17dd0
font_01_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 10880 bytes
SHA-256: a95490c6a9259568dc3afac9771b81f3a79c21b6550f45df075799c69a329a8a
font_02_sfnt_off0001361c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E29 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583

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