Malicious PDF — malware analysis report

Static analysis result for SHA-256 422a94302892314d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 18:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee532dc07d5c76f224c58eb7a7523367 SHA-1: cb323ce03e9beb57667dd4c094fb22acea3b2fc9 SHA-256: 422a94302892314dd029a37a75e9f996e5ce73f9c5931166f9030cc2e147c7b2
156 Risk Score

Malware Insights

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

This 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, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://osmed.cz/app/webroot/files/files/mupelofisajegibulitudurir.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0516167b25---nifikedikujutarilokosiz.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gesajowixorine.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/zejikijamakikufugade.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/92085116304.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/tekuxemaramibifeku.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210828052737639.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/73143390964.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ea061ce18a8d82f59d4c9795af643542/nikaguligovabizafuwewox.pdfIn PDF document text
    • https://brod-plovdiv.com/images/zuludala.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/amo5ta5og55jn9gkstdmd6ellt/24368918197.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/537289add6a1a7af1a756bd9402af725/wamuduripazekawasoj.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/32746366984.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/30754234472.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/o206ikf51pebdl6iu85qspklgg/sotezi.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/79de97b9bc35d1c5a81870a3e033a13e/60669808642.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/75307113686.pdfIn PDF document text
    • http://cx-gl.hu/images/files/13850851315.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/jemipe.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/nakit.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/46jpgs57gf29o0t5ubavfpdi5v/vikisukesomejali.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1397126e4c5085b88c231952cbcc6fc9/73153664667.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/woniboluwosivaga.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080106759f2c---75549364135.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/9457397054.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/22295974200.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/porovijomovekoxatefef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=methods+in+quantitative+research+pdfPDF 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_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 10976 bytes
SHA-256: 779e019552d4a3ba0935b29758090360b1347b88c5f276ea43f6a0aa5f653f97
font_02_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 14264 bytes
SHA-256: 6df8e6d82a3065fcd308c834fc9272aa023fdacf24e7bc460d7b80464e292ad2