Malicious PDF — malware analysis report

Static analysis result for SHA-256 f395d145f8f49c1b…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 22:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74ebfebc1f102e3f9a7d3679134cf60d SHA-1: 2af3b96a1090be599de3274ca01fc27f645b1a14 SHA-256: f395d145f8f49c1b63a4f210449dce508435bca1ed71ebb116a4d0663b09e97e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, a common tactic for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=what+is+meant+by+pass+with+flying+colors PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0af52347c8---dukimatozujibatakatajugev.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/bojokexosupofigiwibati.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6283d6fe9e415575d8bcac89d48fa2c1/3025996753.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608969b3a2901---98040498877.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/keforupakejasu.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/76875275524.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/66871697957.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cc0db36efec6addcbbc982f32ea2f322/sasunagegudejumutamilon.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8116bc898d96ba3b4ff784049fd1671a/kubazus.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/04a65df2f97556ec05c37c7bd4496e02/gizunexijogamuso.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3cf523358---siduvisodejomufanumivi.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kilifukamupajegamitu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/211547729b92f144a085f276137cdad6/65924341342.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7188fa0326---nitazabubitevate.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed5607bab---noginexuzupinemenojak.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/rativ.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/pukezusununipagagulote.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/81568162033.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/70865308280.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/jasem.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/17183ec133083dd8ba9b596a866278cd/66154774106.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/p01rkhha9tfj2s6j9lhmpbedv1/xudisetuxunanefalu.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/78193730814.pdfIn PDF document text
    • 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_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 11260 bytes
SHA-256: 3232bcbbcd381186b5083ee97c33b10f18117e346d59bf2ae76185c326aef832
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 17892 bytes
SHA-256: d5337d2381db9f5f1405edb04f458887accb3ae73eb7393f8472ef722aad553f