Malicious PDF — malware analysis report

Static analysis result for SHA-256 55608d830487e7ec…

MALICIOUS

PDF

80.4 KB Created: 2021-08-17 03:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 736af68470b12c9ddedf7a2d2e4524fe SHA-1: 452280fba7a6c6737115694f78a405f96707730c SHA-256: 55608d830487e7ec27ed3a5cf66557387c3e80cbafd9a3dbba1d92ec8ae0b4c5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079640eab806---67714228254.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/324e4965cd14a23fbb1cffed30da7e33/xokunozesewope.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/radob.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b9dcab2fd186a15b97a10af8daac1167/puvuweferakefejewul.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/6040357590.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/79883614545.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wiluravajevukivofojute.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/lebepebaliwakuwijobuxidat.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/39cad155757cd27b587c366f8bec5ed6/jajunok.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16092339d92fe1---43943161920.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gebije.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/lku3lui94htiktsed33e3r6bo4/zijilapitubesojo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5970852144665a1199e0fa43dad0c675/7823520414.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/muvamis.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/25443423400.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835ebe210a7---gelig.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/17929557902.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/10899452585.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d70cc6c9c98---kufarazesizi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kuraripoderugozajubir.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/maburuv.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/dizitusarinilazuzer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=is+current+account+an+assetPDF 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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10136 bytes
SHA-256: 49240e57b8a2850a21fc2231b5baefaeb67bd2df599a3fa8583e1684105e0399
font_01_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 17080 bytes
SHA-256: 6838b44638b9152d2ccb061e941b79285b0b5542f0999f34f92846c178a0dbd5
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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