Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf81551e1e401e75…

MALICIOUS

PDF

73.8 KB Created: 2021-07-04 20:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb759728ce4b663c5d97afeb6b42f2e6 SHA-1: 89f5c318e7536c7d6bdbc4916c2e6fe3b87d1238 SHA-256: bf81551e1e401e75edf8f5ed3052d98271af69d10e468afbf934091bd679150a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or facilitating further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://absolutelyneon.com/userfiles/file/46961302047.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a26cd0a4---79977413745.pdfIn PDF document text
    • https://jjpremiers.com/files/76997758461.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f03eaeb85a---kufavamakas.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/velogidumose.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f490da44a---24934646464.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833d145cd82---kovivejomanunisumumotuji.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/sevinebuwojegafol.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a391af5cb14---sutemonevitepot.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/2333371479.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ee3d3fcd2c160e5824f841aa25aa59cd/60744911742.pdfIn PDF document text
    • http://4bx.pl/public/file/zegofiruxere.pdfIn PDF document text
    • http://midel.me/userfiles/file/58052176714.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/12355262984.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bhdfvg3423fk2fvprelcihpear/88196993912.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e6ca925a140ecd3ea526e2ecbe57191/rorusugedaja.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/75939981e80ed176318892707a5f8a2d/taxeno.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/89898256234.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/27cc28bfea18d2f70726457c5c524ba2/73531513830.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wilolezexuzotado.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/bosumebuvuvepodozo.pdfIn PDF document text
    • http://stasta.com/userfiles/file/nokaku.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/naxulanaveliguta.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3e04827b0e6d2194b10f1c204b0e6a89/22755223946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=big+mouth+uglyPDF 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_off0000be5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10156 bytes
SHA-256: 7519fceef460dcd2dba6bf1488f9b0397a36b14d89c29655a0b909178b47d39b
font_02_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 17212 bytes
SHA-256: 8d8fb567c167ef3dd37b06cce1c8ff694baad4971c6ae3df5538d8478dec84a8

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