Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca39e0fe09650b09…

MALICIOUS

PDF

85.7 KB Created: 2021-08-07 00:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 565d4323d9008d4cc2e2c9eb1dfc7c3a SHA-1: 0bff8163949edfef401544ac155a291d6492375a SHA-256: ca39e0fe09650b0972426d3a414db01c97dd47041cf7e92dbaf8784e0a68366f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm operation. The embedded URLs likely lead to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://crysiq.ru/uplcv?utm_term=strange+city+names PDF link annotation
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/28778257523.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed57de99f4---jipixebizoputitiko.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e221cac1---rumin.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc30e93db---83396506627.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a33d64e0b---44881774632.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/56654513903.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6c46f147e82c5c75dce8a0b0510400d8/xutukunekusewokanifa.pdfIn PDF document text
    • http://kalikraft.com/images/file/5173637235.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/51140734019.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d081598969037c7cfaf1cde75f81d749/jigux.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/bonovirajufe.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7995128a344d9664cc2b7de0b8b876a0/vexagojoxigusiragobo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c7c808fe5---sibelavubemo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2e1ndmf7gegjcm34vu56ofv6r5/dutexad.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/nufikafonidar.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/gedofozoxokulat.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/bokazaxusekorurorepana.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/86153359903.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/wobesupomasinonetigojepo.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/kibobizuwivaboruzepif.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/1358978484.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0fv1jirosq1clo3sdh51td1tnk/tesasozut.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 17224 bytes
SHA-256: 96a23117cdacd4db39d2a72267cc41ee5b9f17fd297f842a32e8551416cf42b9
font_02_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 10596 bytes
SHA-256: 8f1c2a391138ee22d8b81cef7df36a6a9dc0780b27d810b88c6da330ac413cd2

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