Malicious PDF — malware analysis report

Static analysis result for SHA-256 57735354da0329d0…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 06:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9274d037912de067e5927eadf77d9e0f SHA-1: 768ced71c65c85c1fbefd25fa0b3433993b44a57 SHA-256: 57735354da0329d0321d1dd1177fe4f2787f44fdce51619ba6d402b71df91416
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its intent to deliver a payload or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b043c7981---33657152429.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/i7tfitabsfbilr9al03puqoml2/96456454097.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/lulejakowumilaxurexim.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/3322309161.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297a2b2eb8---17869690845.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/25914524864.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/50310858207.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d368be21---vagokudarezesol.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/mozubedafe.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/vuwasavuzolupuvas.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/32911054972.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b026b4a288---21268422273.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7d44e8fd2f2d7bc5d67a45a002137a2b/telalaw.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/0b8a87f05e175196d531516913981928/pegugifoxevuliwemowosaf.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0440eaab5e---mesivuzemujusizitu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3d1bf8f7---guletubatol.pdfIn PDF document text
    • http://epicridesnepal.com/files/99276585338.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/17cc643b2b91cf08fe894382bb6992c3/53005657283.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a1f5b516a982f370a7a9bceecbc3cac8/rilopimolaradowerurunixe.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/sabinipavutelexele.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b97e2607867da93506ed36dbc8175d89/fepanivotobal.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/40130003972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=margaret+carty+podiatryPDF 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_off0000c0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AE 10480 bytes
SHA-256: 3c00d727f4109cecf4ea872fd7a9e1598daa09415c2c3157c09d8f271b766393
font_01_sfnt_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 16924 bytes
SHA-256: b882aa0f30a0eaac0d07f8e5bade4488f2c7351a0e1bbc5c449ce99a0d11cb07
font_02_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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