Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc56e4407773b58…

MALICIOUS

PDF

104.8 KB Created: 2021-09-03 19:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9474a1aae4665a5f34ffc53a6b6e704a SHA-1: 609612cbdeb1e59ba648e43f23b49d8792688326 SHA-256: 4bc56e4407773b5831425d877be1fbedc14c285a29d332a4a25bb1556146f894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document itself is heavily obfuscated, but the presence of multiple malicious links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=importance+of+biodiversity+pdf+download PDF link annotation
    • https://empresa-venta.hr/files/mixagunusiwaxajofejo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c3d165ae2f7292924d8f89c7df19c54b/losutedod.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/57523728672.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/xujexafivadejegojito.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/vederemabosipufiloj.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/96724678594.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/todowupejupinovafanudez.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dff903aa---juwatitizunopabujapip.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/57849094282.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f579ff7154c---23413995600.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/mubipof.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ed9cd2a527175907ca577a05071bfe90/9564277590.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sawaxeba.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/qs9plaqlfvgg7n69rm7bs3r78f/ropomevefad.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ee7ac24c6---67868528206.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be8e84dc891---bunowuposufosixu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/99181785643.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tuitdiet5ek1k8l05ln2l9php2/nurejosigewora.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6dccbad55a3046064cccb9543b3c8bc0/viwekiweziv.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3fd8dbef8---59262104141.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/2769701034.pdfIn PDF document text
    • http://homeopathyhk.com/files/75253828228.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_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 11136 bytes
SHA-256: eb50f25d9f75e9ba60c4c0039c4b19290d8c4669fc8368f6114ca14005b9c154
font_01_sfnt_off000148a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B5 19564 bytes
SHA-256: 9208a763563e4b55031a8bfdfecb0b57805a7981b9ca5057434ce641c91bef84

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