Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76ef21396a35d0e…

MALICIOUS

PDF

95.9 KB Created: 2021-09-14 09:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b4793a1e45009a27bcec9a0f51a8996 SHA-1: c4b6e42cf905d390ef5deefc8539509c3ce6f603 SHA-256: f76ef21396a35d0e0129b59a50eefbe0e68ce2d47475ebda68e8819a3de87e42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=gry+na+telefon+z+androidem+za+darmo PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4u3eddinss7v04hflgdi39j325/bewavizikevibuvojana.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d93f61c441a8adb3ad3a5ca9bf67ad38/jodagepokotetel.pdfIn PDF document text
    • https://palet-school.com/files/files/55075562279.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/mufesaregabujopuja.pdfIn PDF document text
    • https://diphong.com/uploads/38350469794.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8d14fe9c---9575034017.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/putofopukigazusijux.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/fagurojaxifidejir.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/85994353313.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fejavaboboxewafakojunuti.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/24696025590.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba04ca994---3706866568.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/91222012632.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bujeruneposexipakekiseto.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/89868686070.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/vaxazil.pdfIn PDF document text
    • https://la-klamm.org/Files/files/vubisogakuton.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/pojupebetaridoxijeketu.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/93312674513.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/libakep.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/sukibawokuwabigiso.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/77966269605.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/95600593071.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zexera.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/63360400050.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/gipoki.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161351e8551e59---nurotu.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_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 18096 bytes
SHA-256: f69bb5637c7b0e18e3727ff0ac2eba12c153404ba28f60a8b1dbccc00e09a890
font_01_sfnt_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 10560 bytes
SHA-256: 4c18a3820e1b693432ed31511603145aa97e49329f43b73f23dc34e889a8c55e
font_02_sfnt_off00015782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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