Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0250177cfa2f8b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-29 06:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba0548491ed07c8261fbe1298125660d SHA-1: 8ba80c37000e75d47e8c66aead72fb52471d8deb SHA-256: fd0250177cfa2f8b5ac8433f05dfa92a5b02a6c2092cf8c3053650e74906b97e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bakoca.hu/files/file/rorelofadunam.pdf In PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/bekuxogutopifemadetupuxis.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/57247477742.pdfIn PDF document text
    • http://terrietanaka.com/library/files/tibigutimevelunakari.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ebc88c268e1677a801ebda41c623f179/xedexi.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/12383710748.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/79412566875.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/58585238040.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/71799377406.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/zisogilugelabupeko.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/30994045866.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/mujugil.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c93016c0---dipiretikipada.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/gusewalotirezeb.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zuzezexidez.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/xijof.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/46903852750.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0ed20c1d05d8e48be6b1239a06caccda/59369935213.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/rejexibezeromuronedon.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2d750756---52693375867.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rakesikibesigaranoxejuku.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109230651276966.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/59958061017.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/40750a10d9475a50024134e1f89d1f95/89817420042.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/videzuzenoxoledoxobosa.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/paromikebubuxajegakiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=app+permission+settings+androidPDF 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_off0000b745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB745 10668 bytes
SHA-256: 6499bf55a9675dd832fa0420e447dba765e6e1c1fc862894155ad418c541cfdf
font_01_sfnt_off0000cf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 17240 bytes
SHA-256: 9620e38587c208f1a9f7775363e07e64e32b7124bf530d58e78d6be308f95373
font_02_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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