Malicious PDF — malware analysis report

Static analysis result for SHA-256 943d872fd5a555a7…

MALICIOUS

PDF

80.2 KB Created: 2021-07-06 15:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a6ff2b2c1181d6dc9a5fa18ee01527a5 SHA-1: 09df424f548bdebd05eea159a73b74a758b077cd SHA-256: 943d872fd5a555a77878f0a0a55e38f9e797c395ac944f9aee7d64fe93cc6d8b
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to disposable hosting and compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' lure further supports the phishing and malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://meyergarden.com/ckfinder/userfiles/files/39268651487.pdf In PDF document text
    • http://agrion.org/upload/fichier/58498215951.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/7329074311.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/jamufotugi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/supufidorazufik.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/556eee61694622823702027480245c44/71519631220.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4887a182b9---93083224338.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/24568364028.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a00afc234e5---bidun.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd36b26118---86380518860.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/06/file/20210606_164741_115.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/1848682137.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7891fb0552f98e5217079ce2de8013b6/mimubipilotebezezof.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67585e6ca1---sejutasugemogunetijige.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/dukoxupikipezaj.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/bunotutinol.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/99667225818.pdfIn PDF document text
    • https://bamor.org/userfiles/file/bupijebufozifiliwofaniwed.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c52cdec1f74---zegujutegor.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9pipo21imap3kgdehmppcr9k6n/13084039731.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8f8fe90---fixup.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ba2c6e71---juponibamiwiza.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4a215e2c---sazunoxejerokelujosepa.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507081044386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+outlook+files+from+flash+drivePDF 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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 11096 bytes
SHA-256: c589d11da572767abd26871b1931ba0c53353dc81ce2e23e69483ffcfef860e6
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 17524 bytes
SHA-256: 09b924f13d1e81bc6e6444de18a9450f306eadd66771220b5698904c218ce4e3