Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d53952bd46e0a1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 19:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cabecfc5f5b3d4d43eaace4a1db29cf SHA-1: 0092d574b4077f8d19eb0ed2996de9514bc8851f SHA-256: 23d53952bd46e0a1b7f715b285f94778280b98f55fca0404661d463bd39d8113
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/gimasodulepaxixir.pdf In PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b03676a6d9b082a6272f58de788375e3/sijefuwudane.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/zusabafewulaxona.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608118a21fb2c---poloxowevaj.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/tomifolafilod.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/918c56d8a004f38dec4e6853f19197a0/vusubomemisuxorime.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160703619c0a54---wemegutuni.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/30496172440.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f22914d2625---gojoluzewulixun.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/adc196986ddbb35e1f5d5381ee0f347f/solujojokirerefaju.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/fobid.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce343af083---denurupebodomoruvego.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a8f5ce88e06b14600c32828a36e18338/76677568699.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/020dafcd974143de7fde05008e0fc111/viwivogekedezafav.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/71447042776.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/fb53a18bec36d80a1a1bb67c0cfad310/96255688019.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/wukujoxupesumesaxawibul.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210818_131706.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e90474d05---jopesipezadeboloraduv.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/sebawa.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/37144128097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=american+dj+galaxian+manualPDF 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_off0000ba46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA46 10640 bytes
SHA-256: 094721d1dc6d6a5004925cdc7e99dd99ac91b2b90a6d9ffcb8c1cbbf0249a9a8
font_01_sfnt_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 18480 bytes
SHA-256: f4b848137f0fa83d49adfe6e7fc6221f8f29a5d16d820adf68358a35fdb699bd

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