Malicious PDF — malware analysis report

Static analysis result for SHA-256 9201f1b13678c88a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 14:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 075df1878b0a324be78bc90d90a951f3 SHA-1: ff209ccaf3e05b1bb7b14811056ba92bf90051d8 SHA-256: 9201f1b13678c88a117ff67f83d2fb015b4fe71c8966551cbc5646903c5f14b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to distribute further malicious content or phish for information. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=angry+birds+rio+android+1 PDF link annotation
    • https://atlantidegattico.it/file/bojekunarajefajuno.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/947bd1ed36c4734541f02deb0ce3b90f/legudeloviratixadisilix.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/4703706539.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c2ad376d---46978225612.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/79912898739.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379a92af990---11175270692.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a51d392b---25561266496.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/lomax.pdfIn PDF document text
    • https://aneri12.cz/res/file/53206801616.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/38532167934.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/kutujizidivuluzalirope.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202192302419.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/22650370727.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/62240324734.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/zitijusimuzuk.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dce259b5795ca17f94820ab349cbb355/83979646764.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142245d33f80---49496715715.pdfIn PDF document text
    • http://tayles.com/uploaded/21398826247.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sorus.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/lolunataf.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/13341834720.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/17130872938.pdfIn PDF document text
    • http://tecksco.com/upload/files/48630096918.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/mimogufefag.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_off0000c122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC122 16996 bytes
SHA-256: 2446abd68d8009b96cc103a7442b9b1817879df48a0fbfb831eecc8207a5271b
font_01_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 10436 bytes
SHA-256: cff2f93e5df5fac53db23bf57325dd8d72631605cd8f3731f09f0534b8988223
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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