Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f3568ce2aa5c89…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07c0d0527e6605b8f58df61eeaa132e8 SHA-1: 812da52017847045a92f62292863363dffcc5ec8 SHA-256: 71f3568ce2aa5c89bb70870ee93015ee2310fe5a236b69f86764be9451631fe0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6c7d831a3ee6c76bff83b072c268ee86/vatavomekitodoloki.pdf In PDF document text
    • http://daieimotors.com/js/upload/files/35201179031.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a848f3a4adb---84689849055.pdfIn PDF document text
    • https://stopserv.ru/files/file/80514210028.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/wixelipojadagorufokaseru.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/labufububelurawodenew.pdfIn PDF document text
    • http://kelvista.lt/images/files/34859133620.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/77174872212.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080211cd897e---bigure.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vikusemevudojifepitep.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa29d3c9b6d9fca77a628fffd7dde132/kadozigipevagenal.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/jatizewuvibev.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/kivitunepuladujudalowitax.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a728bd08be7---fepaz.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c504ca45fe657006bd6bcf17bdc90743/24971226671.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070073d23a5b---27190788667.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/42465404010.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/genalizazutopuviravu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ujl3h3kqr8poujqb609niejm3s/3000100150.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870c91e3b08---51953916420.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088b29b95ac9---38983372950.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5017a4bd---fotumenoguboliwimofoduti.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/jhojnsbk8989mcqu32rq2mnug5/52808709237.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/96834397619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=manual+informatica+forense+pdfPDF 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_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 10876 bytes
SHA-256: c0026a541206c38a26b57f89a297d6ce9861d37c6506862ad5d21c7da9b351cb
font_02_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 17788 bytes
SHA-256: 0061a3518afd3d7eea322d9bf1b3624fb4b5f84bf09904bdd8a2af44148a514d

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