Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d408b4873d0aaf8…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 05:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59278dd6d23a260a6dd0ce5e9a56f8c4 SHA-1: 75855f9b762bf99b7fe541826283118e90d4459e SHA-256: 3d408b4873d0aaf86eab208d2714fa8fa475534662d186943a0be423daa66a44
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, suggesting it's designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and embedded links point towards an attempt to exploit users by directing them to compromised or malicious content.

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://oniceh.ru/uplcv?utm_term=convertir+formulaire+word+en+pdf+modifiable+gratuit PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67ff3f8de---jabawajakipivom.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f8da09b2c76a91890cf697dd96d4cc9e/97749333377.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/muxogudemiti.pdfIn PDF document text
    • https://majubesar.org/contents/files/loxamigibamux.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/44697620088.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/407d777e7f4b0fcf4ef8c21abb8fb5df/gadedidumenopivikimiri.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/46786364156.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/vaginodifimelu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210506184513653381925.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/17437614422.pdfIn PDF document text
    • http://htygroup.com/upload/files/16815748353.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607005662feaf---69372079936.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/k8k6tt3q5qomcf0d0f9gtrkrpt/nupesabeduzupovo.pdfIn PDF document text
    • http://hkalc.com/userfiles/sorejuvominerilirufiba.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/66382626489.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/famisaxojudizu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cjo1dlc0v6buhoi2m32p6q4nj8/malikat.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/ponasetomitola.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/77443672117.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/sonarawovexedi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffa616251---fupen.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/69173829863.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/tawofu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d5f9471fd33448ca46edd127ab8ab248/ragisuvafexi.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_off0000c2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DE 18472 bytes
SHA-256: 81fa810f63146ac5a8ca5b388cbeee4be8833fd49498d7109a8258dc08cd445c
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 11096 bytes
SHA-256: ff83cd701d1441352a0192d98d31834bcb32ba5f24cba0810dc3c3e400dd4e46

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