Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea4a231a47df851…

MALICIOUS

PDF

104.9 KB Created: 2021-06-15 21:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fc0f4b7d5444e080f0604b77c1d39917 SHA-1: 240c67cc33c0c0480635733fecfa611285dbfd74 SHA-256: 8ea4a231a47df8510344e29b20c82956b5c3d99dee767531bc216878d05b3678
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of a URL with a 'paradise lost pdf book 9' UTM term further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=paradise+lost+pdf+book+9 PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085c723f166b---wilegebevawagenizaxav.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e69f51d2514cd7bf992528590bb557c1/70965105999.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7977dda415b42ea5e8cf535166753bc4/13895451284.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/19747624682.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affa1d1caaa---luvise.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/87293378322.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bb2821a235d3782cba313ca2087a5033/bobalinodosalif.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e3ee5f6f---49594255890.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/uq3rcqua50d1joce3345fobogo/detoxelitaf.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/24621858142.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/ludofolegu.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/zekalagiran.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/xatuded.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f860a322c3---4744018162.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c0422b19---39423008375.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile/%5C/depepupemifenasinupojo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F65 5396 bytes
SHA-256: c7eba5ea12ba549c2e28ed3a954cc0655e9f0993c5346ed11dcaf1d109a7b613
font_01_sfnt_off000171c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C3 10976 bytes
SHA-256: 09b9425f62679bd3ae1ba649afbd910f74f72b414ef7d14467ade4d1fe0365a4