Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0021f2fb816b12d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 23:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f05b95220eeff3544e859e026d7a3378 SHA-1: f2807b61fdda1d2c2e0cfd7d0e15b1b94478c200 SHA-256: f0021f2fb816b12dd81891c94922e6df2ad204b85178ad4dbeb3996bd6e09235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. No scripts were extracted, but the presence of external links and the overall heuristic profile points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://semangkamerah.com/contents/files/27780096345.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k7gdhgeujk1s6pqc56ghgu7480/zajupatinaferimizerefixe.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/kavevexaresatu.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/33222200331.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/9532732768.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/wepenudigawemaf.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/50491382059.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32e93248d---jopojusizitibisun.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/nabivagupujipovofuda.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/pifesofuxoba.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/51631030499.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/debofoduxovidovozijiveser.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/13647142782.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/nofemuligimapidororim.pdfIn PDF document text
    • https://limsurdua.com/contents/files/4837772368.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xivox.pdfIn PDF document text
    • http://pileki.com/imgup/file/meruvedinidivepuvifapiv.pdfIn PDF document text
    • http://inica.org/files/file///lezazikilejetak.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/litijofanox.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/25206314541.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/59974516327.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc16ef20f---kepuwosejizaz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2af11f1ecedfea566ecb2ad012a874de/lefejibatumep.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/91076244481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mp3+to+mp4+online+video+converterPDF 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_off0000b928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 16424 bytes
SHA-256: db417cb3de5d45a4cdef6610999291b21da03468c2e22b4f2f5a4c6d83096118
font_02_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10652 bytes
SHA-256: 21925c968c757afe23d4c3287bb8a952f5a6b3202b9ae1ebe3fec1e4172e24d5

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