Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5788cc256da0622…

MALICIOUS

PDF

83.6 KB Created: 2021-08-21 10:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2966616bd1b75c6e4255bf1370a1d705 SHA-1: 790f7a634bd3a00dc074e00fad35d6b9b19be071 SHA-256: d5788cc256da06222ec5a234ef3e001d7712b22211a074b24b2654cb971c7371
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ejj806a7v2rgr69g15d0bb987s/60852043620.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608537c37dfef---vunapaxegedanib.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/293329bed1c15cff0e4e1d72703cce58/joxir.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/rapukadajix.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/31751830075.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gvscm0ufk92fc9k2l2tjajipu0/vobakapuxorurada.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650385d136---58314401573.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610134ee67c46---67692577872.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/88296110181.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///joxajoweguxuputobajinuxi.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b5256a9b503---22882628958.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/xibugalafa.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/gudin.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/mamajotixuxonuvupenasaxuz.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tesaluzomozafeza.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe05c24a217---28045829680.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/zazuradak.pdfIn PDF document text
    • http://servmed.net/userfiles/file/rumer.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jekawowitamewakuwokiwonem.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/79878567094.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/90171982949.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/mufilemuwivupilexotul.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/45252856766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=01.08+macbeth+plot+analysis+graphic+organizer+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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 16520 bytes
SHA-256: 169d5273ee0214f201e2ad27cb4d7b6f6ddd4fca3afdb1ca42933482e7c14cc1
font_02_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 11732 bytes
SHA-256: 97bdb63c427f05eaf903c12fcd779e1f8fa7d1d1b65bbadb82b91aedf5bd2f9d

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