Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d17f37b1ca251c6…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 03:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16dee936f02d7a9e14c3f554c2aee79c SHA-1: 741e8af46e6b6b6d031099057e053c9c968a56b0 SHA-256: 4d17f37b1ca251c6e51b504796ef498c96875a055d9d550d43459db5ccad7a8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF is part of a link farm, pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=introducere+in+drept+civil+pdf PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/siuhcbpefvnno576k34conk5oi/sinetetizumeseberexepagon.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3d8b2600---gelibarejapefini.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/raxabikis.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/42263300625.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gbe8prhqmh8e6i1mh2jpsd2vtt/botakalizesu.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dosanofumaxi.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/wudigazavosoluwi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ec867f8af990ef5402f681d9e1e66067/93692564700.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf059a32652---gokipofugenanaso.pdfIn PDF document text
    • https://xigmatek.com/upload/files/ledugadobopifima.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/guzavide.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a981155337e---6739682333.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160845dd17996d---64994517.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0014372001620316563.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cea8839d2c8---giborezemer.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/35993023723.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/mflos8mic4n8i9b7ois4blvo6g/rabonitozaromi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/54744200847.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062013565673499.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/73828709728.pdfIn PDF document text
    • http://altinay-law.com/images/file/63314952143.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bff931ef34e---bobuguxudu.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/xobirexodijabopewos.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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 10400 bytes
SHA-256: 2ff59cca9055c17f2c5920b06250edb395e5c4c8ed5b93d56fa73e0f29bd430e
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 18396 bytes
SHA-256: 4b8f4c42b1f1e63acf7856b232ca98d8f87ab26f460046b7d76c43e455f7da4e

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