Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec68200020f208e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 09:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65e13d1ac44f774a22b9b06384355ac6 SHA-1: 0be5bd635cbd07424fc63fc9e5591b9256654d83 SHA-256: cec68200020f208e74a5a89b2d01036d254f999b83f93c6c668df7c8971f08cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. Embedded JavaScript was also detected, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://armanetti.com/images/12529059763.pdf In PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/80161319377.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5105514b9---mixamokabifekoduzedo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/55da26ff989f1adce5171b3389b43b52/xevutozedibajorawewid.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c37c03216---56942716740.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/75564380877.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/56275135583.pdfIn PDF document text
    • https://steammining.com/userfiles/file/78039941433.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da74f64656---64711122983.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164196ac2b---25685681998.pdfIn PDF document text
    • http://15889163.com/ckupload/files/ruxugibisilekitab.pdfIn PDF document text
    • https://motecx.com/images/file/42050623670.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608137ed445c0---fijagis.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/nolalidefunab.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7jheu70kguhqqfbigebathl4nm/tamima.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/44835508676.pdfIn PDF document text
    • http://premo.at/userfiles/file/segipedidolafulugasefej.pdfIn PDF document text
    • http://df-2.de/images/daten/file/8872091456.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/laresilabidikanovetufav.pdfIn PDF document text
    • https://austarpharma.com/upload/files/ravonoresotisu.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/kesovolovosodujuvalu.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/76513546808.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/bibisuzudopapofari.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/vimazikamokubes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+new+encyclopedia+of+modern+bodybuilding+pdf+free+downloadPDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 17988 bytes
SHA-256: 42779eac5eadde1853539dc5bd642a1687767b85873c5848e0970ba0d89ce957
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 11204 bytes
SHA-256: 7f46f180b11f333138e98f13a72a3addb0b3f761fd098492018f09a7534d9b54