Malicious PDF — malware analysis report

Static analysis result for SHA-256 718959c05eadb015…

MALICIOUS

PDF

91.9 KB Created: 2021-07-16 01:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5d90f93bb569b9f5103eced16cdf7f9e SHA-1: e34ee23794efb665c920e52fd13b2cbe563f9c86 SHA-256: 718959c05eadb015b64febbe3da0359a90d9afed654bacbdc4b8a09ae0d0dcc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://tryinvest.eu/userfiles/files/kixixo.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160899b4cd3361---xupolofazulerusufapovaxe.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5baf16d4e1---wikepurunuvuwubavumopujaj.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bf6297f6---91354222977.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608731bd6298d---gasotamuxilofelusudalig.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a52cce0e4d7---37072426723.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e74f6320894---duloxixawogapuvewu.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/70469192173.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/b0a75b941ca6267c24d555a97a002e19/salufamupepelutelosotirin.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a88c6ffa7---44625575630.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9b3c1ec1016b9bfa534e040920741ce3/5707894300.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/sitobutas.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nepugimusufa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359a8ce38a---81160101067.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/p08pf8m714c20vi55m5sdpb8n3/43524005954.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c75eb2b6---68555713272.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/95427107639.pdfIn PDF document text
    • https://aksusu.com/upload/files/49747919107.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b75dbee8b---nasokezijarematokasosawu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a9f3d818---47779460949.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zubewufavotelik.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/92094778541.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e061f9ae420---79034478491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=generally+thermal+conductivity+of+liquids+isPDF 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_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 18920 bytes
SHA-256: dc9bf900e8481d2cd25e4c2271553d8978059ccc48b916783b03d9847793d204
font_01_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 11204 bytes
SHA-256: 437152a1dc19db67078a0cb93d5821b9ea806d94a07b80d2b5af3ff8d90fa1c3
font_02_sfnt_off00014850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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