Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2d6e5acaa26bd5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 19:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f92031ba78ef5e0a40ce3f548be3a79 SHA-1: 592fc66c4703d61bee84bfd510b28a12e66893a0 SHA-256: 1b2d6e5acaa26bd5fd04d8dc051018d54057b331a8698aeba75b1d4d62b0e487
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://noihoithanhtuan.com/media/ftp/file/ruzamurezusunazepido.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9777821df2d03998b521008e895763b5/mebinavapefiniwaligidugo.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/13300779985.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/33193793235.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/14729696911.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/varituwibe.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/76172157491.pdfIn PDF document text
    • http://cartopack.com/Images/file/wajov.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/7278969653.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108300631136647.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a37e6d8a45---86901678588.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/12blgiajj9tit7qlind9lnu3if/siton.pdfIn PDF document text
    • https://badrivishal.com/media/45859144416.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/kekorusu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/22411782070.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7944b6dcbd---12433784044.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63064dcfe1eebc2de5d93c794ae3b6dd/wekubirugupepujibo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/59affffb81f157ef45a302b19e787249/89621213415.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3453e4e3358fa56659487adb67dae30a/kajofivutasire.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a408ff5caec---52425431126.pdfIn PDF document text
    • https://digireg.dk/upload/11132901247.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/28848406856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=neonatal+hyponatremia+pdfPDF 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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 10684 bytes
SHA-256: dee2756beb7f95df3b490d70a20a47bb575f4ee7be3736a4e9ddc76a41f56e6d
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16620 bytes
SHA-256: 101ffa28dc08e28cf48b4933502f6a79ee496e91b433ebb2f95d9985e90a9fb4

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