Malicious PDF — malware analysis report

Static analysis result for SHA-256 d776c1a3d6c4cb6d…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 01:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b03df7e32f35a1954491556451aafd2 SHA-1: 5b7958a9c007d1a497a26ba8d2526c6e39b3a4b5 SHA-256: d776c1a3d6c4cb6dce57b107900d4548b3b7ea59d4174297b06f51a39ca4d49f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs with 'utm_term' parameters indicate a tactic to lure users through search engine results. The embedded JavaScript is likely used to facilitate the redirection to malicious sites or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=telecharger+word+to+pdf+converter+free PDF link annotation
    • https://birgatour.mn/js/ckfinder/userfiles/files/68302215854.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614852929d6cb---33865340636.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/30/33080117838.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/jemofenuvomajotet.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/fidisebono.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nelegazefimud.pdfIn PDF document text
    • http://jump360.co/upload/files/20210922192412.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/zuxoba.pdfIn PDF document text
    • https://showerdrainplus.com/uploads/files/202109301002393351.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gifutet.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/vararisoganelavun.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461214bbf1d---8156596041.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/gumesimeba.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/mufonasug.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161489ad969e4f---mimexulekojijawaretigul.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xajikewitiwanujuruze.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210914_112600.pdfIn PDF document text
    • http://unsersohn.com/images/file/buguzeziziramatoxufuxape.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/42159096250.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wumikizosi.pdfIn PDF document text
    • https://termoformat.md/img/files/xizadomagupotameb.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/620d345f0b850be5ae7f6504e5b4b290/kukelevaredev.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210917222518309455g9gljh.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_off0000aff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 16340 bytes
SHA-256: f41912796496d1d1a3a72e67f12508b090a70b2b46264e02617c149ef07bc18e
font_02_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 10756 bytes
SHA-256: 6f90cd7a484030c42d64bb952b2bd8b6cd2f482cf90414fdc4dc0ec572c54ce1

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