Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd75549a39ccd78…

MALICIOUS

PDF

83.6 KB Created: 2021-07-07 00:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c61cc6f3afc09f76eb4cb22dbeece24 SHA-1: ad5b3cdb93d8faac4cdc1828cb63a3018f39be81 SHA-256: 0dd75549a39ccd7870b385fc958bb4d7cbf653f7a1b7652b24dc9ce93208ae9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it is designed to redirect users to these malicious sites, likely as part of a phishing campaign or to facilitate the download of additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://adlinefor.com/home/webagen/public_html/korn/data/file/dubosixuni.pdf In PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/53173471111.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/bojugumuko.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fca47e59a---29052012325.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/butizigedegoza.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/fisowudijivod.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80347be58---doxew.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a585f543d05---50361512214.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/39072874222.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/tiludigokodalidoxak.pdfIn PDF document text
    • https://soechi.net/userfiles/file/sakutuvirenaloxaxudedali.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051519375613.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6gmrh45c20kclndvo3t6gqrkfu/gufobevasavugupabipo.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/soxukogemanewi.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/luzepavokedomukewatipe.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/54975299973.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086078d8a0f5---72553014076.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09e71d67f---ranufivomo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160904966b3773---boraduzekalopiritetub.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///85635560840.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/97652091068.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9fdc8559---gupapexix.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070027e1c789---juruw.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/jiremilizikedami.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/79832555287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=artificial+intelligence+a+modern+approach+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_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 10964 bytes
SHA-256: 45082d38a9f54dbef2f96ac48fb9cb3ad48db90625ba09967342ad5b517c768d
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 17412 bytes
SHA-256: 33dd31628baf4433a90da18b6b2babfbf7b86b0c0e6c327df9b4cf634b71a2a7

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