Malicious PDF — malware analysis report

Static analysis result for SHA-256 87470ad3c24c0735…

MALICIOUS

PDF

75.1 KB Created: 2021-07-28 01:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6236135aecaa1e682a71f6c862a10b2 SHA-1: 65aa11fdadd54a913dbdec3ba6027f5433a35562 SHA-256: 87470ad3c24c07352367d7173698be5e2d2b21a2f70fafcbc0a7b5900a4be689
184 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or raw IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a1d320345---87376137491.pdf In PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/buzizijexegowexoninararap.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fb171b60f7b6ced3270102c470f8bea2/gokuxutejilanezoduvikuxa.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/furupeba.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/savagezojuni.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/gabugaj.pdfIn PDF document text
    • http://72.47.203.72/admin/common/ckfinder/userfiles/File/kuxilud.pdfPDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8f5b0afc---wulukepukazopuruzusi.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/joxajekoliz.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/71ec50ad21fca9405c0b5083b50f7fde/66490783262.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f6d5e137---mezefimatubosubawuxugelo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1a1a95da2---zipiti.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/12077992173.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/34383120353.pdfIn PDF document text
    • http://wamer.org/userfiles/file/wozirulexataxu.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wufoko.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/lolipodugosose.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a08dae3efa80e25a801bd059b422fb3b/86180107930.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4cbd53ce5---89252712790.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27989b3688---96592243263.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/51561869051.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/pne5dd65rqkta5g9s7h3on22j3/mireweroxedekabidafiza.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c25a0ccf495c98012e103245520a017a/negapebowo.pdfIn PDF document text
    • https://laser123.com/geektic/files/fiwikepexazilema.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/rinewowufemorumugipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=guia+cuaderno+de+trabajo+5+grado+respuestas+2019PDF 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_off0000be8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8C 11648 bytes
SHA-256: cdf04abce70f4ba4499a5a45faf54e73a59b35a0a2069d365c4efd26cfba01ba
font_01_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 16812 bytes
SHA-256: b1de87a45b70bb758eb1bb32520a8d3bc8f2ef94c4f188c330b86f1facac3f9c

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