Malicious PDF — malware analysis report

Static analysis result for SHA-256 526c7dcbaa4d5628…

MALICIOUS

PDF

97.3 KB Created: 2021-06-28 13:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cae91dd2f3bdf62b6c020e7551bd683d SHA-1: 457eb54af811844e56c2ddeafbda0c9337ec0dae SHA-256: 526c7dcbaa4d5628cd98ff036d2feb05b64bedc1c54a780447f6cc40c2cd69b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc747cde784---gobotovumorojixabu.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609846ddd33a0---kevew.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/60631564848.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vn29lftn415vmfkqtibt3pm3uq/50138736359.pdfIn PDF document text
    • https://maisonforville.be/documents/file/1837816159.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/31398719188.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df67203d4708db5d1eac30b1ce8548ba/tibiwudubisojezal.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fb3ac97c5e2a9b7c936a80266acfc1c3/dixikuwosezufifeboli.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99794cc02---86129576247.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/4205348079.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12521cccb8---latomuvu.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/74695935182.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160931de714431---nufefenamovidufak.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/17953884283.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33d719611---jezetabowusojotutamukuxu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08e323abb---3204068449.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/65200649928.pdfIn PDF document text
    • http://asustainable.com/global/file/35410148155.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf4500337---89452980912.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/44457019343.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4c404f5c88d184cee008d1f3b2979cb9/67308093138.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/533025740.pdfIn PDF document text
    • https://polandpools.com/contents//files/buxofefis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=seven+card+drawPDF 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_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 17932 bytes
SHA-256: 04db0f60cdc2247da416b4f1e969fce75821c13a2625d65c2742d87ec9ad2773
font_01_sfnt_off0001494e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494E 10064 bytes
SHA-256: 382487ad180b12e988bc5b99e32593467cc4d821449d098d5193f0010a66d3de
font_02_sfnt_off00015fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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