Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9efc2a2c8986ab…

MALICIOUS

PDF

101.1 KB Created: 2021-07-08 03:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61d0e4abc506ad7472af440554be5ed1 SHA-1: 016aea51b2de763ef9e1f9bfab24eaf64f2166e3 SHA-256: 4f9efc2a2c8986abbd046b6575c69d4715cce2dfacbfcd8a2111cf72c2047a61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request to entice users to click these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8a6f6cf102f7ba00e5809a0c407ca736/nibebogig.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746127a68c7---pezufiguzeku.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/59aa1d54a23faa8fc0857a2729a03415/gikojenufogiluba.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/7696113097.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160769d8226424---60894713571.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/reregomisirinubudigubiju.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/16468867807.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wedaxenubawejukuxevojifev.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/zugikusexopinubonegalo.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/316345edb768192d92929695e899b85b/46321676673.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090c83de6112---69494101278.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/5900fc9c6ee047a401920b0d2c0c30a8/kofozogeguresejodagafoker.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/90754541673.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/afadeefd9db7ece69ea537735c2ea746/61484025375.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/75652894560.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/80792125541.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0b3a8556d161678f765597485d4d1c81/75381422633.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/70610127211.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/guwedimewojogemukav.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/90667866988.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/kufobufepoletomiwitow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=difference+between+extranet+and+intranetPDF 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_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 17552 bytes
SHA-256: 8806d27ff77efeabcf4e6be3ca54aedd3cfc824c5b4b529afa9da5a7a2613211
font_01_sfnt_off000156ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F05 10464 bytes
SHA-256: 6efcfd3f238e35eabf8b6f2cb6cacb28f33b23075ae09fc3c8342bb5065b4eea

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