Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26db169ea625e47…

MALICIOUS

PDF

90.7 KB Created: 2021-07-15 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f4ba6d40739dad2dd71d70d2cf605698 SHA-1: 389765738b049dc787bf927a6aa37685111766ae SHA-256: b26db169ea625e47ce422c2cdcaf5e38898a2a08e6a77bd9d7e0bd167e13cda8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://daaeportrett.no/upload/file/12943203993.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/uleq2tssbibr3d5gdh9bghlsc8/nigidinesoxidorosijofok.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/sixagiwiradolotedusuj.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/susune.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8914c586---65145021601.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tuwuvejimoba.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c3049412---sakigajo.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/mukajizigonapamijefegif.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/bnvv9fj0p7jils47b1is173j3a/48660312024.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab07f66efa---demowo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f101e1717---bobafajatexoj.pdfIn PDF document text
    • http://temple.mo/userfiles/file/48298062645.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78641b86---93025228586.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/893d6f3a159dc83d596058fb68ebb518/78056088435.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502060436863675.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e45971be022---zonoviri.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a38eefe1c4c41f7cc894704f075346ec/zotowusafazilop.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/4366549572.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/jazitisusisos.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ebb853ce---sulunolerad.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6ce0102a---65144521618.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vumoj.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/pizazafenulefalawev.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609af582957cd---lujimir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=townhouse+complex+near+mePDF 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_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 10700 bytes
SHA-256: df31061fba7e49073ce15f470824f8f51424857bee5ea4429b7331e6fd46deb4
font_02_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 17676 bytes
SHA-256: 1f34659004f75de0ee0174777eda512d42754b15cd6d32eca7467426636ed126

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