Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93bae59b360e158…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 02:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fc50c8413b6a40f909c8d71d8597e67 SHA-1: 5646e28ff1055f0895345f4349c21f2e071ff5b4 SHA-256: f93bae59b360e1582a49728573192e5ce11b69b9567a50073f2951144edfd8d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://scouttautomotive.com/editor_uploads/system/files/99120772363.pdf In PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/76700651484.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/28484260485.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/gipojipagexigemixepuban.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210505022445186.pdfIn PDF document text
    • https://raljob.com/userfiles/file/silizolixijawajekisupek.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/xasigowozabamafazomefugun.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890ba04eb29---duwezisotirubofizexal.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5659044339fc5837f4458c1190bd5762/94721336684.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/9665359163.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/83680192894.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/638322cb6ce624944480e88f67a6734e/80626779289.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/saropuxobodedajowafad.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/sototujefapivodavamumajos.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mawuwazapevizewitaw.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/lusobifobefijutejupagudi.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/balosesuvup.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/81648113809.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b836c7f93---rebegozaruvowokifawu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc1eb6c0d---wolavosagotari.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/20636456419.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/csnl03uj2ech8t7qhmuva8k8p8/59775652912.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/38094266603.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/83715551210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=business+environment+notes+for+bba+3rd+semPDF 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_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 11000 bytes
SHA-256: a936a8f0221ca11d70ee90ff7589230d3c1d4a34dee31735a106ac47a0651d61
font_01_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 18360 bytes
SHA-256: 8e9ddd15800738d95d680ad8678be1044c39b7b62ec6c2dfad14604ab9ba1829
font_02_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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