Malicious PDF — malware analysis report

Static analysis result for SHA-256 3556d9c31244f261…

MALICIOUS

PDF

82.2 KB Created: 2021-10-14 04:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 660e1ac32f88851cbd6465cc5d56c2e2 SHA-1: 59733bffc3534bab1c1e9de87415dfacead8bd04 SHA-256: 3556d9c31244f261a23cfb1764a577561036e3394dfcf77cd1c43960ff704c48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bushregenerators.biz/userfiles/files/kumetufutikopufiruwadap.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/gagulufojororuwexiziravi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a17de7556f---99289793152.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/85996090806.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/wonituwimuno.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xuwufirekepuberovul.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/kojizabatewebu.pdfIn PDF document text
    • https://gdaniec.com/upload/files/gikinozosuwepeze.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/32162889770.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/nivigexogi.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/24973531961.pdfIn PDF document text
    • https://toocapen.com/files/xevixetipajokuropeza.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/95230549014.pdfIn PDF document text
    • http://scsychem.com/upload/files/pizujisuxi.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/netoziloma.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/xuzose.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8a82e7f72f47ba64ccc1ae5f4d0c0e49/bumorefuligokap.pdfIn PDF document text
    • http://8njl.com/userfiles/files/87325401129.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de52832d4d---94561255150.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/28697949981.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144f12874394---73372258492.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/piziwa.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/lomexurenabe.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/49714994130.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/gaxesoxunukazewa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=upsee+previous+paperPDF link annotation
    • 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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10172 bytes
SHA-256: 2f05876ec0c5ebaa2ccb7cf1ee399d3b0f53a25322e77e9debfd24564049cfb7
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 20060 bytes
SHA-256: 06afd345d6d4417331f73e7a45ef106854982985d10284c3dc4d985eef3f2846
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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