Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b61f821daafde07…

MALICIOUS

PDF

90.0 KB Created: 2021-09-14 00:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 73c1c7605273bc5241174c4469b00bd9 SHA-1: 64cbca6c347911293c4d9fefdbcf629e78c67a22 SHA-256: 2b61f821daafde07dccd37952eb9d4ce58e187d9935751f01b41eff2d187a589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://geodavidepini.it/userfiles/files/1095769854.pdf In PDF document text
    • https://yuvasarkar.org/userfiles/file/pagar.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/97euaq1l2fic0vg0qhkd9egop3/90762340309.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pipujazerevazozal.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/47593050211.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/levav.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xexibepitenosobolinev.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/89457882732.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/45017638795.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/pekifon.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/bd45d8f8203bf51d1111e4fd8c4cf9d7/zefoletimok.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/borewebuj.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/41456989425.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f012e5cd---6302503206.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/tubuwanumawasodewavotom.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/jujaguditavagezu.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/868155798.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/xejuzerubafokinuv.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/wodojuduxajilumariromiri.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134a0411ead9---31386714274.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bebc57cd---lewitedudibufakinowaku.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/lonadotozajixarajediwa.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/tuvexo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/denubagijuxe.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/16786147999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=csr+money+hackPDF 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_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 10496 bytes
SHA-256: b13565e1ece7c57948691b211ac580f83c80464c3e3f9ec0f53480c0db04a79a
font_01_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 18484 bytes
SHA-256: ddb74157d4af091be28f404d5aa5ce63b27e1cd98e8c0c657eda2fe53f387f7a
font_02_sfnt_off000142ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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