Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb1da907e801d8a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 04:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 294a3906ce128f548d71cbef29eac31d SHA-1: 9d556828031d20094c7390550e4f0783db8a634d SHA-256: 7bb1da907e801d8ae4294151a7cef380b1a79cf323fbe909f35041a3bfc64ceb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=hay+day+hack+download+2021 PDF link annotation
    • http://splogservice.ru/content/file/benobuviwavupa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/bolavaparesidulonoxodeje.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0655303b7---34192668440.pdfPDF link annotation
    • http://nandeestationery.com/userfiles/files/35508460282.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/64028777037.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/60238931177.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/wajokokazo.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/mufusenafedima.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/21947350563.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cc8742490bf5e2959b7a6afc80d63734/tavosatogasulosinirapu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/43076089686.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd654a4aa---bebewopagixadibut.pdfIn PDF document text
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/zufedovuxajinekulomif.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/pamare.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070511335673499.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210504072837.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/sapejekenosudibiwilus.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/podixedapodape.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3167923ca2---xegabobolagofututuvabesej.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 23908 bytes
SHA-256: 6185edd009a4554b76efe17920f7ee92fd13666ba820acccdfa3a1d3b7c34e8a

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