Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d5023c43f7f48c…

MALICIOUS

PDF

96.8 KB Created: 2021-09-21 21:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de8ab24527a8553371ce1f576149650a SHA-1: 164f85597dce8f0156a42f6fdf12aa5ab284e9f1 SHA-256: f1d5023c43f7f48cb9561a25dbe1b01f3ece29451401a93bc84792e007b13b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are flagged as link farms or potentially compromised upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://queure.ru/uplcv?utm_term=gta+san+andreas+android+high+graphics+mod PDF link annotation
    • http://creativeindustries.ru/uploads/userfiles/file/136034652.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/xowijimutagin.pdfIn PDF document text
    • https://teamcode.net/upload/files/90335502237.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zafopasenonufo.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/55328408221.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/98425490818.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kafujusimotubapomo.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/dujuranagufifojokujaka.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/60219753718.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/vexerufunuxeserakiwek.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/17326202915.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/gekiwarabidutuxijelese.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4sfbpfipqtanv14v1j20rcoab/87503793230.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/zezowulot.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574da83b91---84765735600.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/jenazapulinigavexav.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/fujibabowape.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303da160b5a---nekugivitow.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/5712680583.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/74167238780.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7a6a0303---77697146168.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/88468538962.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/fosenukakotuxe.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/75311802005.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/saregejotanekufulejopun.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_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 17472 bytes
SHA-256: 3140b71c781541efbf8ed2d4a2d310913ad53f38a60c9a44e2d9f86f4f8989ba
font_02_sfnt_off00015bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBB 10952 bytes
SHA-256: a6e16e52fddf3e4cfbc2445eaccd57f5ef87c97da29ced0fd10aecd76dc69e43

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