Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fbd59a2dd6b350…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 17:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0f5d4a27a11d6262d2946f20daff510 SHA-1: 4e24615387a693c3b76a9f2aaf963dfcb332e435 SHA-256: 50fbd59a2dd6b350823ac3f9ef6b544e5d0d529720a33965c1109cacf34c40a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains, suggests a phishing or malware distribution scheme. The embedded JavaScript likely serves to redirect the user to one of the listed URLs, which in turn may host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=linear+equations+and+inequalities+in+two+variables+pdf PDF link annotation
    • http://studiotecnicolamanna.com/userfiles/files/vipuxeneno.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/57e41d1ac909eb56c62976a50120ad7d/57204588479.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/zofawerezinenute.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30ea950df---wedolokajetopimivaxurireg.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/df91ba90fad1b2071b4ab5191392c5f6/66943195004.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kojabuzimojupuz.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/tominomodepi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r0irvi4njlm4nhmn5qh1suomko/neloxonazebi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e2b4e39a---duguvovuveno.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b0d40450---34665581112.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970ce29bdd8---77651101686.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc5d66e87---6513084936.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f728b0eefe---51878991580.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/repabuxepogoxunomosinex.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d54c95c1---85521942364.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/meroxupututaje.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab98ce2565859f4a5ff8929b18e5e871/lewupemuzejinenezetudefen.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/lapoze.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/86648169446.pdfIn PDF document text
    • https://basisangka.com/contents/files/depunejeselijuvedibifire.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/croqpcg9vus8dtd1s8sic8dgbs/bowukudegeb.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/58419148057.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5355659975---pagenifod.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/21546698948.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/pipaxanowupukemujosabaseb.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_off0000bc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4E 10988 bytes
SHA-256: f9aaa1b3cacfd4af7aeb6d278dd873ee2aad77730f7b10c03db0a68844481682
font_01_sfnt_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 15740 bytes
SHA-256: f8fcfebf122a5f3e96450d61f943c745a1688f92d6d067ab00ab6104fcd45659

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