Malicious PDF — malware analysis report

Static analysis result for SHA-256 1843a3a602fa5941…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 04:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7f51fce5a1b4cde592b910c356e0519 SHA-1: 4fecfc41e5525f57f51e18782b3a8b533cd3a590 SHA-256: 1843a3a602fa5941f5d9dc05c1f1e182b851b100be2dd543b456556c3c0a4692
204 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and presents a fake CAPTCHA, indicating an attempt to trick the user into executing malicious code. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, likely serving as a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://pantryscan.com/123cars/imagefck/file/21202178775.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e651395aa---redutulagapugeg.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/62780082173.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12249ac2a---56465369508.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/pudidipe.pdfIn PDF document text
    • https://svltv.in/userfiles/files/wemododur.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/pegivitifuf.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902045006.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/bazepotule.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/24600697584.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/76273581030.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/nuzuwawobof.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bulepowetudavek.pdfIn PDF document text
    • https://ikima.fr/uploads/file/pifolidedume.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fa031537e0715ca4e6fcfae5a4134b1f/dosokaz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/17762350421.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/36877873820.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/9072857192.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/dekupimivikak.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12847634749.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kenafotekidugevoruvek.pdfIn PDF document text
    • http://4bx.pl/public/file/28371412975.pdfIn PDF document text
    • http://citty.org/images/uploads/file/63715453871.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/baravifufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+app+storagePDF link annotation
    • 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 18272 bytes
SHA-256: 944972fd580cdfe05320d0c0c84b751e50d3952c6bf9bae058cc8b0838b07f10
font_02_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 10504 bytes
SHA-256: f4cbd356f6fb40a205682bfe1702cdcb076457b564edae213521fb45aa7e189f

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