Malicious PDF — malware analysis report

Static analysis result for SHA-256 a736412e2e3d7868…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 21:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8bdb29b4134f1f642a40bd0bce86788a SHA-1: 0147d0eee1f883a8d933b66b30c223fad7ea13dc SHA-256: a736412e2e3d78681c7720e3304604cecd43c47a4560b096ddb62503a2a92460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=die+spring+catalogue+pdf PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a3e86743---midijowosededazegumubig.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/46930990561.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e9flfqc1i9g3v2635j4b7od0r4/fijojipazowalabokijanedu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f903440e9c878e2c7332ddc7357f3c7/kemabuvalokobu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ded58eb811e39a5c77cee90da51a5d1a/20235715502.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/e2439c3bfc5c4899d848b78929c957f9/87151238325.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/xadarurapeza.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738f87ec964---rukexuwanixexu.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/towiwugimowed.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/liwutasufubogawudun.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e20fc0e2d---66821294499.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8bf42f4e50661538bfaa91e9aa0f63c/wivoduwogesowazapuvu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b3igied0io2th4ce9c2pbrjs26/doxevikapa.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/32932564933.pdfIn PDF document text
    • https://senhewood.com/d/files/lukoxuzebagenasa.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/83842970760.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/25949317905.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/44067635356.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/fotake.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca28cf0a68---16885625862.pdfIn PDF document text
    • http://valeneighbors.com/userimages/41800903588.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vejibirurapedu.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a05ca9604bb821cd0655f5bedcc1b73a/8887847572.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_off0000bf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 10896 bytes
SHA-256: 792220ad7641c6cb40a206e535498aed65870bc6e32a7f8e86714cafc8cf9fe5
font_01_sfnt_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 15600 bytes
SHA-256: d0e3af3f478c81da2b6b493f7ca0bef161c8e456f45ed6e5f0d47584093fa8a8

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