Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b9eae357a81421…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 00:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 230fb410d4ddfe834c61924e40ce2581 SHA-1: fd3707a78cddb663649b4dd35271dca4b568a403 SHA-256: c1b9eae357a81421aa7e079afe0d308a59fa6da92c21bd14bb77534fe9d9ba9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=spider+man+game+mod+apk PDF link annotation
    • http://petukmahaaaraj.com/userfiles/file/jovubevipej.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vumisomasuvenizapab.pdfIn PDF document text
    • http://erdbau-rauch.at/79701113653.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/nenufuzenodibuba.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/13029175155.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e47c1b37f---xipukirugizanixinaxifajis.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dudip.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613506219fa0c---91223870240.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/19541947620.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130de4914bdd---fijubotumasawilox.pdfIn PDF document text
    • http://trovas.com/userimages/1504711032.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bosaze.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9bdcf79c---52007888813.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/74544645716.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/buketamumirubo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sojudewaxu.pdfIn PDF document text
    • http://progetec.org/userfiles/files/431445102.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/nasegitabosoxizi.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/pasekewutifinuzawinoto.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133171282584---33328531492.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/81992582254.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/fiwajosem.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_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 16952 bytes
SHA-256: 9b78ce1dcf29db0e89696a846187f2f64ef435a1d755438e96e0f33701c36d17
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 10592 bytes
SHA-256: 48b3746eb8d83d73cac92fe3e18561492682bc3a622bb14418488b3733ee459c