Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d22be332e382845…

MALICIOUS

PDF

116.7 KB Created: 2021-09-18 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9e92455d6081c71e0acbcfdcd728482 SHA-1: 82c32c1e024fb4bdc3d97d53e70f36c7982814a6 SHA-256: 9d22be332e3828453c5f2ed02f48a2fa1260f5f7b0ba4bf153b8f5da3360ff14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms hosted on various domains, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=james+joyce+uliks+pdf PDF link annotation
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/sufigotisasaz.pdfIn PDF document text
    • http://cudicio.it/images/file/robex.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9644e24c---rawuferixedekota.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/wezabumekudut.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c0f337729---86997828697.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/vizilumikeme.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/15338522054.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/37849171263.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/3196422007.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff748162ac---xirirevemenubiz.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/rufifefef.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/28810645541.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914005612278918.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/taragek.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/31354551884.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/27648037152.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312eb228ee2---rifekaduwaf.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/74dfb9bbf6bab22db081483ee9fa6c9f/duvofubazawozilezowozosuv.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/11924358340.pdfIn PDF document text
    • http://poiskvod.ru/images/file/paxujomokunijemer.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_off00015db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB1 21020 bytes
SHA-256: 444919f6d4077ebee28d593aaafb0d69a098e4f8ee84163a32848ca27816a905
font_01_sfnt_off00019399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001abb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB0 10908 bytes
SHA-256: 4fa18e12c5ed730d77c51ab131ef43eea3cfeb55f3f25f372b9e4c2c3b75f62e