Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16006b4898dc663…

MALICIOUS

PDF

73.1 KB Created: 2021-10-02 16:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e69e76919ed98326be5e90f5089b380f SHA-1: d0132ccbe61755010d8ba50e524c2bf3a802adfa SHA-256: f16006b4898dc663e751a925cc9fb5ec8e1ca5363c37503f6972a23d9c2bc313
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of numerous external URIs pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to obscure the final malicious destination, likely a phishing or malware delivery site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://crewmak.ru/uplcv?utm_term=deviated+septum+and+nose+bleeds PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/itq97e3k3uivqiie7do93lmorc/bonasigixuvetejija.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/74287155479.pdfIn PDF document text
    • http://risme.vn/files/numunopifufobejedifego.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/29833488812.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/82444279721.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/sozugukuzubovavudelito.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/pisagotilatobubob.pdfIn PDF document text
    • https://desmar.cl/gestion/admin/images/upload/file/37884887005.pdfIn PDF document text
    • http://retailcop.ca/files/37473718330.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2ab16c7c---21609912373.pdfIn PDF document text
    • http://chinahongji.com/d/files/61506865218.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/biditogenubulojere.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/bikotugaji.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/nulutigusowofubul.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ec146c9f7427cf238ad06e82d738859c/16780285874.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/wijiwurika.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136512a84c6d---nirakogo.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210905053656.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/44344770791.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/sezisatinemuxogudirusivus.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/21788776535.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/18044479697.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/85365203660.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1a1a55a6a---44207769211.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/noxevigaj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8adfe56da3d99fb4f0eb8d6e993132d7/zuxazawamomakeromuri.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f45966b9b8---nufakoropefa.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/91311752817.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_off0000b958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB958 17548 bytes
SHA-256: 4756bd01c18d3a6f9b3507703dbb8dd5aacc1e30827e7978d4ee22de4cc96298
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 10760 bytes
SHA-256: cbdef2799f2b32275207da48777e7d64ec2c6cafe362f5990228624355f7092a
font_02_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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