Malicious PDF — malware analysis report

Static analysis result for SHA-256 304f0ae76d9d17e1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 16:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 370d8633c51d82b02dda2de93dc077ad SHA-1: e0662490ec7ad299f6890e325f117f320a021c2d SHA-256: 304f0ae76d9d17e1cf221799437e5c494c8b4b8736d7a4141cb6d5f52aac03a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous external links, many of which point to compromised WordPress installations and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF's structure suggests it functions as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=best+small+stem+colleges PDF link annotation
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/14f3a82d83bd27e3eb84f82892bd9827/zonumiroxazafutiravesowi.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/10105677236.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/muweda.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/seposo.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/71018015636.pdfIn PDF document text
    • https://coevent.ru/upload/files/bidiv.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfebdbe32---sawuletavosizogubaxere.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac381c393---9435303418.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/datikaxofav.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5bdfba6d0---60447859806.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/punelamepa.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tut2sjdf1tvica4ilpd6kfsjvb/28464407388.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9d33d57677b87671c324bd98f2f22f57/wuwebogumozin.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ace0d56d---258504356.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/xojixifujifumevasi.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/73672833308.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16298559507544.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/pujosumozivapakete.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45763547f---jisawewade.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/bafiwojixobejawisogoseja.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f4f2d1f21b707221e21d242c9e07de1b/pedanilikipuvulafarerewoz.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/xifeb.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbfc59638---87963172767.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/pudimemaz.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/84025172324.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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 10332 bytes
SHA-256: b47fd6e7f598103ae3993e240e3740b1c9c96a03a4e95d09f5671a2d7746f9ee
font_01_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 17700 bytes
SHA-256: 2fe92f2f0e154af20053912b777f2c523be37979664c4629027087761c6721e9
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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