Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dbae03a052516e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 14:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c546d6ac5b1b082ecc19b5965a4887e5 SHA-1: b0cc981fca5c001afd453f21fd5e23ef448340b6 SHA-256: 19dbae03a052516e213834a7121c982f0c541cf5898a583182f2ddd71774cc92
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially compromised CMS upload directories suggests a coordinated effort to host and serve malicious files. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 http://jiehuist.com/userfiles/files/pipetenija.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/cd885dbcf8492b3784dc21e46a088ca0/zomure.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80a710b7e---94365762344.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a54c3644---63420651032.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/45470634741.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4094dc2f0c---9124932490.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2e0e39b62---96824423902.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pp6r2uig6s8fc2e4dmquvlj767/xuninejetetubup.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/23663035944.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/87563791417.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/67147618282.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/bemizupunadabile.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bff01671e---nuxukikixif.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0dfcf19f---64204011711.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wogogorebakojofut.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/taxepirufuk.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160efe5f56fb0e---zofixugejebozu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xabakebotizutuzixugigojid.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13099592133.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vlsemknef9ngdajaic2npbuvhq/78612302738.pdfIn PDF document text
    • https://auto826.com/uploads/files/95625988292.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/damedusapunorisave.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c62d23acc---mimetelotanop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=verb+forms+of+understandPDF 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_off0000c3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 10584 bytes
SHA-256: 5bc609c17386bb238a23232923b7d369091d48c737d6ae37c1411eafaab59c06
font_02_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 16928 bytes
SHA-256: e1df5396935660ae96ba0c47119e389243607d14cf8dbc7fdc52ef92dd630198

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