Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b9ac9b55356602…

MALICIOUS

PDF

73.7 KB Created: 2021-09-30 20:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08257e0f72b3d6fa664d185076cacb06 SHA-1: 0774fce5e6f4563e823278c643588f26321efeab SHA-256: 59b9ac9b553566028a75f6a250969104de91c7712dbe17d89e6b91c38b8a0983
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress instances or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious content. The presence of embedded URLs and the nature of the links point towards a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=anatomy+and+physiology+download PDF link annotation
    • http://mwflower.com/upimagesfile///61108618089.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/45902680932.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/93071534311.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/11354913404.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/vuxotisetokosaxeta.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/ritijofuvaliravet.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614303e7820de---momorisulopuwigi.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/29065309558.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210929080827.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/46300752589.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9aba92640c4ef582c4cc0ffcbf923bd2/renunudomosureranevasa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e0dgfa8red6jhg72ndjf2kp5c1/dubemozibulefokodagirutan.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/nisamifu.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/tadovupitaliluvaf.pdfIn PDF document text
    • http://www.pilartangguh.com/file/zemebumakoluparazubisika.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/7306120226.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a1ac1c992---22416182234.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/73575394594.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f624d68cf---borudodanelibejeduz.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/42749196733.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/56687301772.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614820fa0f546---64240771326.pdfPDF link annotation
    • https://turkuazhost.com/calisma2/files/uploads/87130451262.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/lozufoxugubujo.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xazalofadepedopivi.pdfIn PDF document text
    • http://seamacros.com/upload/file/sadesiwerilowibijawuxiko.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/38606751196.pdfIn PDF document text
    • 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_off0000bb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB24 17600 bytes
SHA-256: 045c64efa053882b049a5eaf889a452948742e591d085d29aedc7cd1cb125eec
font_01_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 10788 bytes
SHA-256: cb8fdf01557134e29abb43a9d219c6a88bab3e83fa72c7212628a2436feab60c

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