Malicious PDF — malware analysis report

Static analysis result for SHA-256 45481b9bade0abf6…

MALICIOUS

PDF

85.6 KB Created: 2021-08-05 23:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc709ce8b5c01d88e83a9604fffe8658 SHA-1: 72521c16427e6433f8d76e6d0025e16218156447 SHA-256: 45481b9bade0abf60daa3883c88012d2db4f34199d40d963c34e7e3f282b2ed3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS upload storage, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://summithighschool1958.com/clients/71652/File/zowej.pdf In PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/xomejo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8d56727b---42407474194.pdfIn PDF document text
    • https://inncredel.com/uploads/81508979008.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b43389595---73782007556.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jiduretutunevasosi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kemidipexudajuzametebo.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/29836512294.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/getavabozuzajesumew.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5653359c1516b9f621b24bf5fa059518/gufugosatobifenerabifod.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/09bd832b31de65d88b5db1a03fa9d59c/11461996233.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vajigetiv.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/84990686082.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/944pnj0lbhalsvmg6ac24pc98f/50326283762.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/weguwu.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/navusatekemasafino.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-18-21-02-22-10.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ade48998c---xexenubujutovo.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/2306185180.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tcie02rpnsp3c4umg6m6k8ea59/zifidudugob.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/wexafawojikaj.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b2576ed1---vamatazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+are+the+common+methods+of+waste+disposal+brainly.phPDF 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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 11284 bytes
SHA-256: 9f078f0abd8f1a09a109afc8fac3031f5f9887f5ea72512ee07e0e5e7b61b8d1
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 17104 bytes
SHA-256: 61919a51983f996a8f6075c18ebcf4ee78456963458ed5894eecac09a3f9e86f
font_02_sfnt_off00012fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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