Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f95435bbb1b2310…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 12:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3173fc1b37c1f80eb0e383c8f6cd7aad SHA-1: 6bce42da1cfa075496278d11ae65965c87e57edb SHA-256: 9f95435bbb1b2310786ab4033ae1962d06d76eac013184997aad0ff8293a25ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sobateracota.ro/mm/file/20154368022.pdf In PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/16685105610.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/folefa.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/kukubegogubix.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/napazepitabanubuwijini.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/64cc9c47e1edca3585743a97504c7ed5/fapovujetaz.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed0cf2676---22645934830.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/19826023769.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vejas.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/3458807716.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/ridozu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c898bf1---ziginatufupovikipi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/76303876129.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/xizekukelufebuvoriraba.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/verasevug.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-10/20210910070047131197.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/xegebodusulod.pdfIn PDF document text
    • http://195exim.com/datas/files/68336741380.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/bolesapoxavepatitogalafuf.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/24215733202.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/35307690824.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/44620968949.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/37457522366.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/tukofefiluzuz.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/fixofijefudosa.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/pekuvemuxipirowom.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/33927748052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=x+ray+camera+body+scanner+appPDF 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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 10700 bytes
SHA-256: abbdb06d48704a1c16aca9df45f4bcaad06de5ce6ee654c9bcf64613bed9e0f5
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 17856 bytes
SHA-256: bfc2df70f37d498bd3c2368fc9213fa3d46ae5064656e0abba86db9a3622bdbe
font_02_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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