Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f4e7ee2e8e27a9…

MALICIOUS

PDF

98.6 KB Created: 2021-08-30 16:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d9a153074630efec827f8464726d6a2 SHA-1: 0500e1ec36c1cbfb53eb47b5e64d7131de6ee55a SHA-256: 82f4e7ee2e8e27a9ee6d94f1038864484b50f38953e531d1f7b8b6c82f75ea0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to host a collection of links designed to deceive users. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sabidiwenulo.pdf In PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/54741091843.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007c05de6e3---69096977355.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/ditarowubup.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/juxoxipotixugufisufimu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9773544ee---53153143748.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/melugufomabapar.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9700a97a2---7611557483.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/najesitovabaxananedewabaw.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/36866478798.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecea295a02---21727037439.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/81897565946.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7065346db2c887bc41d25977f1a6f3ce/94281625293.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/fisame.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/12382786793.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d503df14fbd---53216225416.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/kugawubofapuratiwer.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb94044b---33507926174.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63648336921.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f72a8db46---89668381100.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/verurixumolizem.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/91425668525.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/latefi.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/pipitotif.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/76ae9e3057080546b775075eb1b3ad72/kakirokonekotinezani.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/wazurum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rivers+in+sequoia+national+parkPDF 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_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 10692 bytes
SHA-256: 313d14e17a26271d0c6a050c6e4267938f5495496ecc3edb1541fa6bd17a1ff2
font_01_sfnt_off000130a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A9 19220 bytes
SHA-256: 142755e9d3c46705d15ed567c8a6c114b33c79528bf3a828e6dce27f54f226bb
font_02_sfnt_off0001637e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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