Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efbf5e491eddca5…

MALICIOUS

PDF

104.3 KB Created: 2021-06-18 15:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 44c5e1dcd6bbf4d1d616ed06fa5047eb SHA-1: 462ba18bf6f28ec08defd5854ef2fd4496820233 SHA-256: 2efbf5e491eddca50438c804fe81f0b0b44ab24574ad9cc70a157b3146c9c279
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs likely serve as lures for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952a046d52---tiwekokejutabujomasinam.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d73a193a---galakebipoxapafupaliwap.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6b2e2762---wasavete.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7c3ce8cb8c8b98869a409183612e92a/5471829066.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/85068744038.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/97458635690.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2b2a93901c52516c73bd7e7e2a1b88cd/toladuwatawiniton.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09b2174932---58892138876.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9faef6ec---21977872713.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608695bace855---zijovenabiw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c213350a9d---duxitesufax.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/kideloz.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/78dc89682d591a65911684e0d12456be/fapuguvot.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5bd134ace28e6cb1b30150505c7a6a01/80139059622.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/96839839746.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/31108e7b3c8ab215d0c791be03a9574a/16228872795.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59307add16---tukabawem.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wekopemovulikupezanatuj.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/FevRqgeaUVY/uplcv?utm_term=english+file+intermediate+student%2527s+book+answer+keysPDF 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_off000156b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B1 5712 bytes
SHA-256: 397304f96899e72bfe59f2b3d3aeff2534931fd9a5e65529bb38fb60206567d1
font_01_sfnt_off00016a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1E 12384 bytes
SHA-256: baa487d0308bcbd274122732ed6a516f17d4e5268e56fb2b98b8bff8e5f42b86

Open this report in the interactive analyzer, or submit your own file for analysis.