Malicious PDF — malware analysis report

Static analysis result for SHA-256 4961ca3b851f6f72…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 13:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: facc547357bb38b0912b50e8a32c5232 SHA-1: 9cee1c8ac6569650bda728644bcf98af9bd49b33 SHA-256: 4961ca3b851f6f72a9e3d1302efaa02739c35d8d1261067101f3ebb8e6d400d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://viettincapital.vn/upload/files/43993365639.pdf In PDF document text
    • http://teplorium.su/userfiles/file/53533949584.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/832868deb9d74f2c45ce01df5de9a2e2/6911835877.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0289a2eaee---zumuwuzodogalosugolinir.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/34d9f086cc7cc34b3aaa9103dc696823/32841121083.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3mijjh9n6sr81crsgle8q1njuo/79494381969.pdfIn PDF document text
    • http://spiregene.com/image/files/20210729_212446.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/nubafiwolejuduvixiv.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/xeviwawuzegukuxew.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/kubizu.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/57654909735.pdfIn PDF document text
    • https://cet.sk/res/file/82194491182.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f22976bfa5e832b5956a05f705e64060/11239933543.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b59e5781c---49053731561.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/46153290089.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/bamen.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/3e35786a12458ffbd7207b3c364c2527/gamov.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91125638b---siwenixoxol.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/jexuxoximajaboma.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5ee0a44747155e3f717908bbb1a1e3c2/zuvolabubikesinebeja.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3127c2e8253be35d98bef5144b808a75/gukalezaxejejavakiluwifaw.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/vhbrjrp129tubqoce06q3eifvm/mobazijegetarovusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=adjective+order+worksheetPDF 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_off0000c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 10512 bytes
SHA-256: 0585c67e0e121b543833d05bb0c0ceedea69c4a7ee7a7bb4574c2ec191dddebf
font_01_sfnt_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 17648 bytes
SHA-256: 590d97a86a26ca6d1e086836492df43fcab3ca0a88902c6d158f47bf0c93723f
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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