Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6939b91309de117…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 23:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88a244eebb68b203c5a03c25091493a0 SHA-1: 6a03a42dd7de53d0b5ae08362ab02aae2b15a6db SHA-256: c6939b91309de117ba306c59d32af134f64259ac4cef301c8cbd76dfb33c08ca
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=technical+aptitude+questions+with+answers+pdf PDF link annotation
    • http://geredekombiservisi.com/userfiles/file/mowebixuvojogolizekosi.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/lexedikiro.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/88795615345.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/figefejodinakenolovefo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/92170672342.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/61544910515.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5d2c13303eff609465a42a2ef5adddf3/rukodiwabo.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/faturakelop.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/94417681448.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/35032156017.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160846b09aecd3---dozelamuvis.pdfIn PDF document text
    • http://elm3rad.com/file/96535097174.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/61021126018.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/023b901a8cb12d798cebacacafba3afa/48795640354.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092621a3678a---nivajodeda.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/51609582369.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/4811820664.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d30109ab72ff90e4d32f5969b1edeca2/55786465178.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1f24cffb2f232829b869f6a409269ec1/69347184073.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/57791825420.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/77323646754.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/fifelakitorarikumukimijot.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210826203249-86755037524.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/sokariwujew.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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 17376 bytes
SHA-256: b2998bb92fcea048a5bcb091bb0097fb58403e0e1ad4786b81b13c7f3cff4227
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 11012 bytes
SHA-256: 40840b45bd00374f5c80a1c1bbbbe4be90ba53d0af8c8c555ae668bfc352fd72

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