Malicious PDF — malware analysis report

Static analysis result for SHA-256 291efbeaff3997e2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 00:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94f00f3ce0d81248ed2008824d87cfde SHA-1: 5c3cf6a42ef2473d2a2fa3022a9ad10119474393 SHA-256: 291efbeaff3997e2dc9e1dd8260c62004644eddd751c7c15738e6bbcc881d894
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=object+pronoun+worksheet+3rd+grade PDF link annotation
    • http://tourister.kr/userfiles/file/20591979274.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2b2dc315---7879135249.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef157a1612---10967931483.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021521445454276.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53023491010.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/65892496130.pdfIn PDF document text
    • https://iohrp.org/f_files/files/toloz.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/68703053598.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffdd850031---40183446974.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb54fca7e30a94666a14a68b0baa31a8/fukeli.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/limepigikawabuzogitakuvav.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/12951049370.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/gutukipol.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/7f6af9819b140c01ae76af9576733ee5.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4c71c226---gamazona.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/vudizopufifazekuj.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f221f2ed---22111213600.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dd17b7b1---taxeruwojurubedinemitaj.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/37184951168.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/fusavazowizulanaxivarepa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/870fb393da0678104520711c0840cf14/ganegereg.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/64197241760.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nenafitonaguxisebobaki.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/80748502486.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/64776877823.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/71448317396.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/71298949255.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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 17740 bytes
SHA-256: 62bc39dc607ab1e42c7f7748f6cf8d8524bf5cac9325ed43505c0b6b0536919b
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 11400 bytes
SHA-256: 317e208dafedb20c00ef7f8436975333d80cc0ad1d5439d2ecb1dbfe540c2cd2
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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