Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20c936ff1091390…

MALICIOUS

PDF

101.3 KB Created: 2021-06-26 17:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b97481891c6adb72525193b6daf9580 SHA-1: 52906ed0d36e9991e33aed4a108654107a4f362d SHA-256: d20c936ff1091390d5925e291edcef559f85797348ab67250a4eef116532a286
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 sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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.
  • 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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/povpe48glfn92e8dsr4rjlggtr/kenezup.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/serazebaro.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/eenbdumesld1l2d3f6vkuif4b7/jizilopodagakolone.pdf
    • https://adsbudget.net/userfiles/file/zufuxoni.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7uh586ol7vsedgpe8jkhup24q0/99795123866.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079716e25103---diveb.pdf
    • https://fajndoktor.cz/images/file/files/9677615818.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/tilativokovuniba.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737cdce4245---14495408478.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/4nn14j62j5os2oirjgh7j5r0m3/novitefosoverazuxem.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/690d7a2af4b69c5d9f12f55811dd5312/pebonox.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bbe06e39d44d32691c2af1d99554eefc/forisinaborupi.pdf
    • http://newgrids.com/userfiles/file/74774351993.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a0402a02---23119216334.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ad524fd29af9126a15477999d14e4458/judixilag.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/64315734947.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160903f7a581b2---mexogasirezatasikipus.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e830680843---jipefatewax.pdf
    • http://trendybiz.in/usersfiles/file/95531869351.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76b5bb8bb---61844036622.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/60228799484.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/s6n8d43qnurhr3372o4r24e5f8/94031161223.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b8b34791---89327268989.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d84b1e690---69650039983.pdf
    • https://marmarases.com/upload/ckfinder/files/51258847078.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf51b5c83---78508773259.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=one+court+of+justice
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012897.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 16792 bytes
font_01_sfnt_off000140a9.bin
619170bd2a00a4f28bf2b4868ba8df9ca4f1ad9d8739d4300714c3ebbe13fb11
pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 17676 bytes
font_02_sfnt_off00016f0b.bin
e51ecd362008e91ad1712d9964afd7290c1c5e813d6f260827f0c5430d32ac5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0B 10376 bytes