Malicious PDF — malware analysis report

Static analysis result for SHA-256 c619142ba4ba495d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 07:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 335356e9192df520abf6b94711b619c8 SHA-1: 770411db5e78f9a6bb018f04b2dae045f6a7a9b0 SHA-256: c619142ba4ba495d30a31a16e8278e68c78c4a276f5e5247541345b3e03ede6b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • 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 https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/72215151599.pdf In PDF document text
    • http://naphotelbangkok.com/userfiles/files/wusuditusilupik.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137570bf0e29---45546032663.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9uh3md9664jsao1918p19cc06d/bajoxerolu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9d839f5677d3bce9c2e07b04fc16be0f/75080566791.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/4406434530.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/41838880492.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/butatujesomirux.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/eee2159332239951810b7df2149acd07/72080730264.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614378b152613---kinodugepogojazofeliril.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16144068e252f2---33797874229.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/vipijasonim.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/31223797382.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/vesugifev.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/muxifilofopeta.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/38205533554.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fca520065---15935178168.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/58140838344.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/43067207598.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/63220305900.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/sugovafibawafofetisi.pdfIn PDF document text
    • http://ruihuitax.com/files/file/8307008291.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_B7D2775DF2CCAB44.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/manoremogovexisunilofu.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/7922679745.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/10155518462.pdfIn PDF document text
    • https://ags-car.com/upload/files/53735464092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=black+ops+zombies+apk+iosPDF 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_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 10576 bytes
SHA-256: 3ac1c7a2e532fffbb578e656e22e4706a208fe65f9c167f248e9c6794f066ed2
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 19268 bytes
SHA-256: fe463d5313fe265c1c4a96b93b77a39f06833fea50d7978f67ed08728dd6236f