Malicious PDF — malware analysis report

Static analysis result for SHA-256 13da339c08b213dd…

MALICIOUS

PDF

327.7 KB Created: 2021-07-06 21:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ede31848ef51a7bb90bf17a45ab6fe91 SHA-1: 7562c8f9a0081d6b31794bc945f2b9a61343d176 SHA-256: 13da339c08b213dd3b88c7f807cfac94460a52fb4725be50d7fb37df4a641e20
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a 'link farm' pointing to compromised WordPress upload storage and an SEO redirector for 'free-download phishing' strongly suggests a phishing attack. The embedded JavaScript likely serves to download and execute a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9f3521e33d10e5cf7850e2a7cb157b16/wubamatasomorolu.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/033e50f4c10704a26ce543e00069ef5e/safezuzegu.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/83120755911.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/70358887823.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/kudet.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/96770115446.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8f6a3b101dbdb1ab70a3abc6dfaf9033/kubetinatame.pdfIn PDF document text
    • https://kristinanamaste.eu/files/49792395906.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/16432046169.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/2256904d43bacd5ee59f0e1d37e14cf3/27133703144.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rf0rc5nd09tekfj9kmmef9hir2/9824340909.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/545a9894f7cc1c70f7d5fa161add8685/13846037079.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2cee09d5c8d8bd4737642ef93349c817/63443818527.pdfIn PDF document text
    • http://digifast.cz/userfiles/japaf.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/113f55273982efd1e83d7cae39d1de00/41264266912.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/93745810477.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/petorasuxobaw.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/58d6b0c46e418cc68cca00252e02564e/xosoxide.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/95iik0k2gcor95m8agmlami3ca/81871573606.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/teriti.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b6fdafc2---84876985757.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155f06c8c1---75734955825.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/10168435507.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8n8ok32iatbbgme3np080kirmn/newalarudidobotap.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f6450cc3---54207094604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=iview+2000stb+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3640A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00037c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37C1C 19768 bytes
SHA-256: 423b8d523d9d4ce7d424eb550f41393265d27ed18f32ce7b19184cc18bb33165
font_02_sfnt_off0003b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B0CC 134192 bytes
SHA-256: bfe4241bb76f24ea6cf1e4eff52e23110fa194e8e4464b882a59d741a5645aa8
font_03_sfnt_off0004f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7AF 10632 bytes
SHA-256: 039df3a51fc1a6b5b258ba733740626f6f3f8f6d08b017d7a7e656fe5beef9da

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