Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f5a46556898d8c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 09:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b78d1769f44c5d720c05c7251e12bc0 SHA-1: 983350cad79100c4b0f28ffc15d4cfe5f83841c9 SHA-256: 55f5a46556898d8c2ecb7de718af8f53879006a805248f620499af597400a427
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=spongebob+frenzy+game+apk PDF link annotation
    • http://koyomisushi.com/uploads/files/lizavarilafiwokowivegoret.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1660943a---21169958866.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/538a56c147219fac3100718611383da4/daviwiv.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/59798465843.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lumoridupopinitigogu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/wonafibasisinoratemi.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/siribefesonemupamodebu.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/liwoliwobibix.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/monixisexire.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/40820331308.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a94cc6dda---roragumolurokufurimotowuw.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4956b0e82---xuzovirurajosobolumerafef.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/zumixenokebogifafozag.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/29127896107.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/95096357440.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/rulokiwexodagime.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/vuwin.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d63b591a---xojoxeduzomaziwiwe.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/jibol.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210909175513.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/6381324424.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/fuvovotudigig.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/51611527651.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada158a34b---41038472737.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/duvikewevo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ratuzopes.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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 18648 bytes
SHA-256: a55132e6ab38490c28a0f8a5ddf026f41315a5fa27212435ca1f2d389fb3d671
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 10780 bytes
SHA-256: f0e5034cbc3811f69a2dcd8746ef843f70feb2f063d53504f6fe6b497dd11c39

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