Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ecd95879542f16…

MALICIOUS

PDF

120.1 KB Created: 2021-09-04 17:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ea3fe278f867990e1d329632f86bb6c SHA-1: 9f26c20503698ea50848836112aaf5b7395ac852 SHA-256: 23ecd95879542f1602c6b3e0058b4722336eba92e9c3dd233ecf9b6d2e1b22f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to malicious content. The presence of link farms on compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc95ac29c---suwirasagana.pdf In PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/97899537439.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee2dd20cd---31738589576.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/4508819045.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/12563462652.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/22016337788.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/gutajefifujaduji.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210725120137.pdfIn PDF document text
    • http://tornado69.com/clients/40643/File/fitelo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608753153528a---gofuj.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34cb6766f---85668481368.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/79562287410.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/65118235154.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/50461466991.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c77af841---42445041769.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/midudemopebotetorupem.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/tegezefebapeviwojux.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/semunuzebamiraku.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949855b71dc---11852762145.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/78812456994.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/80689563420.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ob1h01vp4vs86b6ftj04ou0os2/lutalowape.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/f19qbe730maajieiq3un4tvck8/20677509269.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/tovefefugamijuxisane.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610c79dad58b0---jijipavexixenazarufozasir.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zufomovorijodotexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lalitha+sahasranamam+meaning+in+telugu+pdf+free+downloadPDF 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_off00016df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF3 19144 bytes
SHA-256: ada45aa9d7b6e708493a47a6c8caaf7a625dc534459d97092e8a85e5ddb0ba8d
font_01_sfnt_off0001a021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A021 11088 bytes
SHA-256: 7da75135f127d2a9b1df472be67c7b79ef620d82a01ec62508e80f447fc6405e
font_02_sfnt_off0001b9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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