Malicious PDF — malware analysis report

Static analysis result for SHA-256 306580ef54f555c7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 12:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 001a6385393136000c2de4f0f29feb72 SHA-1: e044ceceaf0683d42522026da850b9167125894a SHA-256: 306580ef54f555c71a394a38f012947c6e08cf5b33fc4d19f4203360e3c8b15c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or SEO poisoning tactic. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but potentially masking malicious JavaScript or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=figurative+language+worksheets+with+answers PDF link annotation
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8119f11bb---86372881672.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4f352ab69cbed3684ee8179ae6effa12/67883073292.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9h0mto0i45sf00rbsa62gi35n0/40644255603.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608906ff3de97---gerixuziwar.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940aeb683ed---benopononone.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/pumadu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d12da5a2---muxekuti.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/21716777793.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/83564335960.pdfIn PDF document text
    • http://goldmustang.com/files/files/memepetoxagazolexavapiri.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/87945747791.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a6c822d2---87722170569.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/pirinudukaloruxi.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/93239576831.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918e74309b6---33999607822.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/norepivujonov.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/tizun.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/69e61e04c2ebca23cef6b57452fa35e5/32505657536.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/latorademak.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/99512874709.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c5c7e8299f92b6e0843201e64656cb77/xujepal.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/lunurukonigifex.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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 10708 bytes
SHA-256: 3bf6da8fa722efc16a3dbe94f6bf0b85ece52495f128eba8e4b82824a711441a
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 18080 bytes
SHA-256: 51c89cb6542c900a864c5daf4e8ae2c9959ba749f37a7e9610c3f606608e8c63

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