Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5144778e459d46…

MALICIOUS

PDF

86.3 KB Created: 2021-07-21 02:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 574a4a2de4853935f164fcfaaa9b3631 SHA-1: d6f3df2041a166c1598aea394ba4a918fffd70bd SHA-256: 8e5144778e459d461c56fb53b43df32459766bbe4a07ffd18b439d3769b3255f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as a distribution point for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://halongbaycruises.org/upload/files/98112645361.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5baca639---rofazifigenum.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/563fc162d25bf60de02820fb1e41d46f/39354905348.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/cadf9bd2d385b00eda5ddda7f04bcc81/xafimewazozazet.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/90921548bb30cae0a6f7ffce4f62135e/32958066107.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7bbca0ab---sodinirurogutojuvepaw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0f5e204a2fe121226c94ae675d30a734/83025371590.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/15904993413.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d9bb0b7c---15510277626.pdfIn PDF document text
    • https://topupdana.com/contents//files/junupalasifonenedufu.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/tojobiv.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jekamumulutebujop.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/66707584590.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/efdqu3a6rv7p3gkljfo577gt27/nilile.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/14330690980.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/ninaninovu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a82b5ad81f51343af729c06963c8d2e8/28005197981.pdfIn PDF document text
    • https://kristinanamaste.eu/files/84389677461.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/53943561474.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074694873fc7---kibavawovugidelijinuna.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/makurawoputavisabow.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wumadozijamupad.pdfIn PDF document text
    • http://lucann.com/Upload/file/xotajupevij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fifty+shades+songsPDF 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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 17992 bytes
SHA-256: c01aab35354ee9f8261d2b9309e7ea77e7d5aaf99f2b395d223903c4d6fbff93
font_02_sfnt_off00013446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 10576 bytes
SHA-256: 2651e21474936eb01580e176e2595cce86a7681e38533555bff42107391ecf94

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