Malicious PDF — malware analysis report

Static analysis result for SHA-256 a748fe03279abef6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 07:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50915189bc74e560f2a36a487eca240b SHA-1: 788eb2419bd862f9c38d0f0e9166ce16b7367c73 SHA-256: a748fe03279abef6c323457567ca3685ef3e64f82a0e77367581ed5cb127d8fe
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, many of which host further PDF files. This suggests the document is designed to redirect users to potentially malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=free+rhyming+words+worksheet+kindergarten PDF link annotation
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/277da0e7446135b2223ee2dd4c571523/dilubelube.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/vedixexuse.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/21655995101.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e788cd667---7379213715.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/50259278515.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/49897806617.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/91803153625.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/dibevegunazetujovudapabu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608080461be4d---gerevev.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/18528381940.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161184b482b6ae---mugov.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/418031bd9f4e4b034f10f3e608ab2b76/wonabisezij.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/36254282730.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/zapopujexan.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/roxixugowemibolevife.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/83406039752.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/mofitabumizusuvenuserok.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/94940137789.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ati451cldf0kko0mlm9jmnrgal/24600497969.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/72832725416.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e1a4767e---tinosopajaxanetib.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/99972951099.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20218232116207284.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_off0000b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 10920 bytes
SHA-256: 22a8c485a821986cbed1db073d9b4de5958e6a897514439097535db6982a3595
font_02_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16664 bytes
SHA-256: c6de7e9e91e9c2f800d3e0bb736f80de5195a2835529ae957c705c546ce99513

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