Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdcdd9700d9fd96…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 13:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d648a9c2d363bdd81feba53ffff46a1 SHA-1: adc5aaedc72d2e35a1bba0572e5d03af0b0610bb SHA-256: 7cdcdd9700d9fd96010c504a8746c8a46fdf8f2554ba36c693c1d4f146a942b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://studiosiriosrl.it/userfiles/files/mojifakawatebisurekuse.pdf In PDF document text
    • https://secolink.sk/userfiles/file/xotet.pdfIn PDF document text
    • http://imbirimbir.ru/files/saxumafubafowowut.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8ebf7d299440df0a2845d08402be769d/lilofemasoru.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210903_941E959969E46156.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/naxagopeloxodavevog.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/38581129503.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161327d8d5d8dd---14752538375.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/26080728614.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/kakoj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134fcefb238b---sowimebexora.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/3010056321.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/rixulegajunozok.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/80238109075.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vezemirewoliloredifalagid.pdfIn PDF document text
    • https://music-group-store.com/upload/files/49420044743.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/bupeta.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/45313882136.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/95759558887.pdfIn PDF document text
    • http://enewind.com/pliki/file/sopopulojenofunanulaba.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/18559543538.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/tegupupidulaxatoza.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/66918882002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+tablet+frozen+screenPDF 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_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 10648 bytes
SHA-256: 70868e4bd84a9bb4c01fcc13394fc4f461d076e3396c16ad8f80ef117efbe548
font_01_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16508 bytes
SHA-256: a0254572f48356becbfe7489576de022990c97276cff26f6b203d00041e39eab
font_02_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1