Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdbc0c75482042a…

MALICIOUS

PDF

115.5 KB Created: 2021-06-04 05:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d10b843cabf8eb0e257e71b8f53e1741 SHA-1: 4688e8709eb4268543866d2628c1db8cdd2d6a7a SHA-256: 7fdbc0c75482042a84f7e03645039032c4c4dfab8e0a23a7736b734f908616e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a2d87ee3---fupuradoduwetobugoza.pdf In PDF document text
    • https://africanresearchcenter.com/userfiles/file/saluneboburowawobupi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/91ad75795a85fed42067e24f40d9530b/37079208531.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b3c145e3---95404048391.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/94672144001.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021052212211289.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a52d1d1c54724bc6b58d39c5813b2ac3/28451708344.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/2544032463.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbdc72df3d---61391555931.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4d91d5c9a324172d757e54553ce0421c/kadomopizisolurodaw.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/38424004322.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a12a68d8bc3948d5bdbe7e61a258e63b/13708091788.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/fae0f476757bc86d7b3e3962ba880e30/84887314286.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabae8026e---23678855434.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/io79v1n44vkv1c9a7rvg37g3aj/3848273993.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+trade+with+thinkorswimPDF link annotation
    • 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_off000188a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A4 5152 bytes
SHA-256: b86420547331d01feefce57d5690342ff6bd9735f7d489f37d35a1910e995a92
font_01_sfnt_off00019a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A09 11660 bytes
SHA-256: ba49e0b65f847a517f61fcdeb1f5e66a20ab0dc35ee78fb05663da7eb7de8c08