Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a12c50ca49c85e3…

MALICIOUS

PDF

88.8 KB Created: 2021-06-25 16:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fc04fe863f8a41b417e18b73ddbb39f SHA-1: 3c8bf6a4ea87654b8da2ffb9595017ea6cc31864 SHA-256: 4a12c50ca49c85e38fd03bcf6cab6379ec68ac2559557288d567ac8a2c91af54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using documents to host or link to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=mmt+of+hamstring+muscles
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e836ad9531---gabilugavuna.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/76373e5a239a09a1f04524dd7bfc17cf/16801606752.pdf
    • http://kientrucnhacuagio.com/upload/files/21010943593.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb053739a3---tifinuwavejuxanoro.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4330e5eda0---89223773497.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da4f74ed4---bazotujedugu.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6vvo0i30rvjqn6e4kah5fpe24u/jakazozazetezas.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed18335f33---73990681568.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/ranevabawanene.pdf
    • http://ahkjt.com/upfile/file/jewemuzulosugasiloki.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5be54027---sujusowewomakenivigodi.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77553e4a8---84718959257.pdf
    • https://penal-garazh.ru/files/9771337022.pdf
    • http://1utilaje.ro/mm/file/8405977271.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/aoq0lkrug5cfstu0241spa8hu0/fofefosejixikid.pdf
    • https://powermailer.in/userfiles/file/zaxutegapowe.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f40450793264c25220ad839dd3d57192/tafawolagugatet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 16792 bytes
font_01_sfnt_off000110e5.bin
befbe958b21bb28d9210b766206ffca7412f3b9d3ff0d08f4e3eb3c079f787b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 10876 bytes
font_02_sfnt_off000129e2.bin
0babd510b5b6bbea263a21a313eccc3ea612bb8178a17a3fe5643d6ecd9f3cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 17256 bytes

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