Malicious PDF — malware analysis report

Static analysis result for SHA-256 d203faaa4664a546…

MALICIOUS

PDF

91.9 KB Created: 2021-06-11 17:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 48fa9b4a49d89fc776096a0aa7ca61fd SHA-1: 7d7ead6e0ff311806f6ab012e48338ae95ba71bb SHA-256: d203faaa4664a54625d0c813a4a4c7e678230c820744b7c74169655ff75b4b7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains numerous links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/uplcv?utm_term=vector+chapter+class+11+pdf PDF link annotation
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/gua5i0i4ro2kcuab20i5s84hk0/zuruvazujenuleragugoze.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/kuregefezawatunexekul.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d86e41177---nolisuxegebulunu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/potimowomadivozi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607262ce5ec8a---83654468318.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a9ec368472e820146bd58c4639f4f306/dimepuluxono.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa58528e81---88302549733.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/xipujajazaxowunasup.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3533da5b9---bulagujuwosapujekujose.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gazomexuvolajol.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9b17472e---sovosox.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/26917468218.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/934646c5775694859a66fa209fab8838/35208940676.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/171788424608f225ee0aa4.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnhf3kbl8c077ksgb0q3t1jno6/mebat.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a4036fd4---7498972167.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 5260 bytes
SHA-256: 542bbc09a65d557c18a710c089a0d1d1d59e8ee8d2fd90e8375a9e08fbe03ef3
font_01_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 12204 bytes
SHA-256: d2878f43dc8d29bf1a2bb44789e847656dba79423b1f99472e92c99f84de1c2a
font_02_sfnt_off00014ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE8 16296 bytes
SHA-256: 5f127a91c175ca99ab40051e51498cff3b30fac5ac67ac18d7652e7f823a14cd