Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f090f31aab9ad2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 08:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0bb885b9d6101b7550c285792c78598 SHA-1: 96289ad5206b1ea066fb4709f780d04e43e182bf SHA-256: 92f090f31aab9ad2b50018c7f8bfd98f17a0e26941bf445baa056daed82733de
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The document's structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=one+step+inequality+word+problems+worksheet+kuta PDF link annotation
    • http://donghobaoan.com/uploads/files/92432011475.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/84536938667.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f449d6864c9---74380055202.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de61ae40580---43082744527.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5ad5b65c2cd78ff750b1e284cfbeeef6/viluxome.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/27249814209.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/61720279734.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/lupibudusebixisevewulo.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0hmpi1n3ptte515lndealt9dh7/tomanewosuxevemimij.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609142421f0ce---62797677721.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/gotobu.pdfIn PDF document text
    • http://poorclarescork.ie/images/65627348760.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/13057415202.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/sikozafekexojexesiz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ccaf423f1---wotivivo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/03ca70030fd72fc439fc64eaac98a5de/tusukezin.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/doxij.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/917f5fa0c6ba43fadd33fa977d6367e5/nusevuxipatopusosibu.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/49120504641.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/93443588187.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e2a8vlaiqn60hvo02g9ast9jc3/29314776457.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9eeb2581---93520190475.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeebbc5d2f---48644200498.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945facf2cc0---ditazonesuxa.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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 11360 bytes
SHA-256: 4805baf176a61a514e64e488dc19ce8c41b103a21024636d0d76652ca906fcbc
font_02_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 18224 bytes
SHA-256: 25ac01a709eebebd298a0552f8da043fbe817757bd84a2f34ead303ff78ef0e8

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