Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c8afe09e9a02b9…

MALICIOUS

PDF

90.9 KB Created: 2021-07-22 23:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26e88d864b12faddfeb7e313323f4311 SHA-1: 422ccce4fe840231bf932206c5da904e9472f357 SHA-256: 46c8afe09e9a02b93f6699f2a1cd828c3b9011d6067843b0ffb2a2f7d21f808c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links, many hosted on potentially compromised CMS platforms, is the primary indicator of its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b13ba8f92945350cec2e8abb86b9b70d/suwenogezawoval.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3d192b03---27440348052.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/87511881343.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2aedeaa663703b55565ba153f81407d0/96220473303.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/87132843024.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gugibadotafanugefozetiwuj.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/64793529248.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/revidi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/uv6ejjcm9mpbu9tg02mbf7as24/sivizilu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc9288634---76414719557.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/91974585912.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/66317453862.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd198a7f4---43906069437.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcdd95e39---68581177992.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/480eff64e88f3495b62e1008265898f0/zigikopiv.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/bozenanoripo.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/87900128631.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/87114746686.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/prv3gb379a2hnath20p8s9hqk7/jesetaladufazidagu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f389fe7ac71ef5d7966a8f1c01cee9fd/65591916435.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b817813f6e0---42809034369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+free+apex+coins+2020PDF 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_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 11028 bytes
SHA-256: 4d5032e4f9893eaa818f998e690beef2ce5d8906a5454b8ad2c8301dc2c7fada
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 16976 bytes
SHA-256: 7e97d9f4a9256a5883797c0478dc15ac434e60d55629e6e3bc0384df4333fd1a

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