Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43f5421c9284a9f…

MALICIOUS

PDF

84.0 KB Created: 2021-10-20 10:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c07f8f526ae9c8f57e9e30cb1693c474 SHA-1: 9d16ae555e24a78755938df4126195f7ce7bedde SHA-256: b43f5421c9284a9f5ede53574d1fa436948f203f6d8d1513778c386e21ec0aec
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of multiple suspicious URLs points towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1616ea4feeefe2---72620152888.pdf In PDF document text
    • http://umhouses.com/uploads/files/85028026270.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/dijedu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sojedubokab.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/sikakipuka.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/judolarababerevad.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/mudofewudujajerem.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/japoluxamenotilejirodar.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/24063915661.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jalozosan.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161452fff6fc5e---tutozoferivutezev.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/xupuvur.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/wapanuwesejedu.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/34459143861.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/biwevefagumesadububagebir.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/13369598171.pdfIn PDF document text
    • https://training-access.com/upload/file/ravarinugosesujiretewibir.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2235aa2c513b3057e050d3970046994f/mugukiburezobasovuden.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/tusaterajog.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fenatavi.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/kunekajodon.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16165ff6fe1736---vigapumagobikalulix.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/43172665329.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=how+to+clean+a+tim+hortons+coffee+makerPDF 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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 17120 bytes
SHA-256: 9a995d925d3746887000cd83598648ebf7f654743e94d4be3673c9e1ecef4768
font_01_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 10772 bytes
SHA-256: 15fc9a6b85a7bbfbe716f18a0e797303fd090c6a0d80dcc7663b344a10c80dc6
font_02_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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