Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbeb5f41f91c3ea…

MALICIOUS

PDF

87.9 KB Created: 2021-08-09 03:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3b0d40ebb259ec3d439247d0fda0320 SHA-1: c8160f263c909f90ce07c50c3485c74223b2f075 SHA-256: 5dbeb5f41f91c3eaf24eb85f1dbcae2f8349dcfd2eead6b3d7f7edf47abb208a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass security controls by encrypting payloads, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=periodic+table+of+elements+with+names+and+symbols+and+charges PDF link annotation
    • http://branpc.in/ckfinder/userfiles/files/relovoviw.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/67341348096.pdfIn PDF document text
    • https://onlinendttraining.net/files/kakisebovevoxigeziguzu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a25b7bff2fff1913ed11eb6e89af1948/wopuxeresegi.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/82371024399.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/60511857697.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96b6c79a4---waxagiwitorojufora.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/bimujokazobat.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92889b8a00---8453322014.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pavamoxuwiwojunulixewa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e975058eb84fbf80015aa85d3eb7aef6/revawib.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087554fea3a1---jevepi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce11a558c---22682182907.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dc5b6943f---86929706843.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/47abc5a1b1db134a577187c3e05c2152/83101118275.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/nuxeridojejomivu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/petigutoxapix.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2616855c70---rubogazapoz.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/disasitaxebupubulopafak.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/38fa5e379952831656d682b5d49080cf/gefelaximefawip.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/40115702227.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/mowenuvorowadojanumeri.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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 17528 bytes
SHA-256: 7e631da8d2ad0349ba0878effa18581b01602554a0ef2ee210dd9c603f2691b7
font_02_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 11264 bytes
SHA-256: 8c31c946f62779276b98943555895e0f4cdfc72f04b070d087a4cefa87da1acb

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