Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5267ee8978799b4…

MALICIOUS

PDF

98.4 KB Created: 2021-06-17 06:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 910e173d3fae559737718238858a9865 SHA-1: b2db8a254bcc03b3e21ba3907331c00e74d18203 SHA-256: a5267ee8978799b4ae9537495d923bbd9c2c991939ac488859c20fa2627b18ec
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6989

Heuristics 5

  • 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.
  • 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=wcst+manual+pdf PDF link annotation
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/26e3e41ddc5f9223daa6efdb6b92b648/kukodepefururefisasoxav.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/rusinofitijazinexefuzeje.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/176qffoivh8rhn30om6j123deo/99031703337.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/59064730166.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jetotodakaritijusir.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe264131d0---ropajuvukoroburivedunebu.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/17145605069.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c46c52a7---82328625885.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc37e596e21---36279920181.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2q8i1b0vq1r90bgjiar93b2ibb/70729981823.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8ce062ce---7778675245.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/853203a96f251a9f96ba53e16dcca3cf/97396713373.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/79155879495.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a9a12f90f---39293218989.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/99350359671.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5d33a4f2---gakivowozonul.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/75350240752.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B68 5220 bytes
SHA-256: feacff40b08fa5e6fcab06caa0698400aeaf74a95074b0ce2a64fe2633963994
font_01_sfnt_off00015d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2A 13620 bytes
SHA-256: f5908a4e6ad3b33fe9f98ff0fe68a3c6e882ee3878a483edfe09f3d855b64c13

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