Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8080fa5f47d019f…

MALICIOUS

PDF

97.3 KB Created: 2021-07-19 04:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70c211ff8ccc2e5294a3a1210acffa5c SHA-1: 4f6efff492e77126fc6f49a5661ba99436721125 SHA-256: a8080fa5f47d019f667bf0490413506d2b86175a1319534c239a7b2fb38755bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful 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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c043b344eba---229409458.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160944c73c54bf---42745860017.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f71e59645---61976563794.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/04434d05fc90f6ff8bfe601b0362e33c/bufilixan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/abd4a9714a3fb6103787d90ce4e265ea/52245282507.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df498edf62b---59626355170.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/78875013227.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sabamagutumobadarugetak.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/dezipowulogerumikukezes.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/ziwakumexegozajixajazosa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdda49ff71---41266177206.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1e9b7dc3a1881b357d5aab80570bdc7/nonamuporenebomugofukox.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/titek.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9b4cbf83---babew.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3848005152101499aca5ebfbf0e11bda/duvupulowigilotesepoziguk.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wovonixafobelimekoxefewel.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/suzusagilorenupo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f3cf0f267b0ae8099bc6202050423f97/vatujuxaso.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/kubokadapogukedamibizik.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/kemowojor.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b4e8ab01---gewume.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b1277b29---sijumuwolozexofizi.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/kotepewunovolijevobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=out+of+date+meaningPDF 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_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 17296 bytes
SHA-256: fd7447b4b8a6db17621a77827de67e6cefd43db440425e1e5e773b63e15ba9d9
font_01_sfnt_off000146f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F7 10508 bytes
SHA-256: ccb8abf2df145537c60186390d2e515aed78ce1b42ae0d03b73edbe6a33ad7fe
font_02_sfnt_off00015ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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