Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f615f9664dad10b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 13:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ff2da6f555185d56f47a210449a8b20 SHA-1: 8cf81dca0189fff07a95344ad8b379c7d9f1703c SHA-256: 4f615f9664dad10b419e2745e3a33ba0ffbb63d83554b03618bb2628adb3f71d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://youngthisyear.com/ckfinder/userfiles/files/12999276085.pdf In PDF document text
    • http://85560891.com/upfolder/e/files/20210908202853.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/topibageze.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/38001432455.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/mefumi.pdfIn PDF document text
    • http://belean.pl/userfiles/file/dikugoguzaf.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/81465111960.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/lilevob.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/31513765676.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/90b07c6373d22963e921bc2d39ba73e8/18928706485.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/fiwozedotasujezej.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/77387024571.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/24355933281.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cd88c7439d0e1acab5293ea331bee8f8/bobuzewigigijezolel.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5053df60cb2f0213348fe739ae3e468b/rifofazuk.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/33865105717.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614092d820c9f---91941388358.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614416d73277d---25405459485.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143fd2176f35---renejudafu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43221291014.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/17073091927.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/fususewiguxo.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/pukigizebu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a690ec43847cfcd8613db8fe5fedf4e1/kenobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+mp4+ke+mp3+online+freePDF 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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 17472 bytes
SHA-256: bf9f62ca46ad911fa568b837e2fa3fee0ccdeae4f43e016fd97d2ef05da96e36
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 10628 bytes
SHA-256: a5672efec2f1ac83fb023bd58371c71d2eff93137a82abb89e785fb032cae0fe
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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