Malicious PDF — malware analysis report

Static analysis result for SHA-256 344ba88cefdb1455…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 13:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e7c7c14bcae0b2c155de867cade844c SHA-1: d36ef4a1a5b73ef8fd258ba5addc6d5a712ad0a1 SHA-256: 344ba88cefdb145564a74c08754b443cd8808f1d96754e60648e7c62a71f1df3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

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 http://istanbulballoons.com/ckfinder/userfiles/files/dimifirenuxi.pdf In PDF document text
    • https://atrax.hr/files/pidapuxogisodedelu.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/satudafigawewuxa.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/popuvenuselewavexaju.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbdd065cf6---60199699409.pdfIn PDF document text
    • https://cargotavio.ru/files/file/musisi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6a839toavrqfmcgkac5n3k1m14/kemekugoweganonegawe.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/safabosusukipudoxo.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/52864098742.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/49833548412.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906102836.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/javugoziguxaz.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a02ba8ec10919eb7f2ceacce02d861d5/91136660477.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/20933113248.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/47471578253.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/65288826750.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/30244462452.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202194165555442.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/332e09f20baf948a5d516f7ab748993f/27195613840.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/nejodojodudaxifeva.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/5978699386.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/00be16ce8b0ebf7a5146ae016c19abe5/73541501353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=games+keep+crashing+androidPDF 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_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 10948 bytes
SHA-256: 672c4f0a75424a606da032819a0efdeaa6193c4543e9a24cbf46665b4397934e
font_01_sfnt_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 17912 bytes
SHA-256: c4b57d080509c1018d217565a1fe20b835290366e123908449ae10d7966acf97
font_02_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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