Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72619ea78eff8a0…

MALICIOUS

PDF

72.4 KB Created: 2021-08-13 21:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc92a270cd8b30b3185958ad7f0d41bf SHA-1: f22b63b3abd8d67553bab7fd0ee17468453f23f1 SHA-256: d72619ea78eff8a081ff8e97b9053064ec0bd7b8c98197be17aec79786e6bfc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the redirection or initiate a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=ramayan+chaupai+pdf PDF link annotation
    • https://rajatotogroup1.com/contents//files/28191976319.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/21777559406.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/537a5f7920adce775fb7b7c7823b8bbc/13883437508.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86a67ee7e---36644643684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caead6c66e---40048428411.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e1703cddd---bifofuxoruvoteku.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/dusemen.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589964fc71---gubifaderenir.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ed5a82a46e9f2c70abef4a3cc626a67/88154491125.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/83856395127.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/51006002582.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/16310841838.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c176bc0844c---balemuwuligeferikobidij.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791714cb387---zimikowodafomenoziriv.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/00c9mfk5d52jkaibi6o7mkska9/dupezozikopenuwegorufe.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/82176173862.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/letemefovemuduvesi.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/8c90c509a289f0d54211d0ed35c4edca/61084500679.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/rutikaxim.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/komovadirevu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/17786416058.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/gozegab.pdfIn PDF document text
    • http://geodez.com/pliki/file/71021272104.pdfIn PDF document text
    • https://goldenapp.net/file/wijikeni.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/80143396922.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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 17132 bytes
SHA-256: 57caaacf8da055399480d9a9b67d084825c7f8f1e5e9631251b4dd23566ee57d
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 10480 bytes
SHA-256: b5609a73760e0fa1e60ca933613e98b41f1920705b5bcf414c374df7b1345f3d
font_02_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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