Malicious PDF — malware analysis report

Static analysis result for SHA-256 5080887d0b923675…

MALICIOUS

PDF

82.6 KB Created: 2021-08-31 15:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7589973ae06f2e8381c9d452fc087f58 SHA-1: 44bd3750f672765d4f468b059126ad6ae35d0c14 SHA-256: 5080887d0b923675aeb686253105d3a49af65102c9b6cf6b37bb49cadcd737b7
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, many of which appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The file's structure and numerous external links suggest it is designed to exploit user trust by presenting a seemingly legitimate document that leads to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://coretry.ru/uplcv?utm_term=nothing+else+is+matter PDF link annotation
    • http://abwmountvernon.com/uploads/files/99940932147.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4de4dc3b8---98671694563.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/zusob.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/99860144355.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26afc28b8---60139659579.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/7468535877.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718dddb5f5c---74206365846.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0189a56aa077555549fd613583d6e7be/1214923683.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/nobosetemebokuzotamekonap.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xabegabon.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/21718049011.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/womizinore.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/900e8b84a7e1cb54823770cab23520f8/13138115677.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5debb60d1bab52514f8cb0a167c8d25d/gevitarep.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/rabetegotugug.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882c9ae914---jozetosapamoxavozozizos.pdfPDF link annotation
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/50cc51845651bbeaba228f391e710c75/18255576876.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bf0ec919e5412e8c2f4d9df104c1e23/gujukonup.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/86688968165.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/11595511645.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/rilupudejerokulokuru.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4rdgoh38qm1dpj4qalu9fs2e33/48185842017.pdfIn PDF document text
    • 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_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 10532 bytes
SHA-256: 09b6eb91efe0f44baa33d49edffe28e288c41ae875ecc176a7e58447dfeb1697
font_02_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 19408 bytes
SHA-256: 4e2008cae7bb7af0072fe3e160ac8e76bd305e0177ba91a3a80e1d2d198fc000

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