Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56d99509a8cc1a1…

MALICIOUS

PDF

100.8 KB Created: 2021-08-09 04:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd272d4d255949cb4181cec06567abd7 SHA-1: 5fc97fb30d3eda98f7dba18ac6a1f83c70c568fd SHA-256: e56d99509a8cc1a1ce3b1d5fc8f0bd187b030cd9226f34a289eba745c052d997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or conduct phishing attacks. The structure suggests an attempt to obscure the true destination by using multiple redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=sample+picot+questions+in+nursing PDF link annotation
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/dtsuqc65d5g386ga56j524u7rk/78210609445.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pemigakopaso.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xelonatiniwe.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/63655256402.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/96559263025.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6864f702da---55705734739.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/29631324880.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/p9fs1fv7m8ev1k83sri9scsn06/67103436056.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/bamureduluxi.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/77129646699.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83e86d29c---8015290442.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160836846ddc66---22959819138.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/97858054121.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/tetuxar.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/40856689925.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621554118.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0c295e4c562f420a95e28138dbdb7787/nosagupenogon.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/17021547663.pdfIn PDF document text
    • http://petrduchek.com/files/64458060262.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075db048e361---35365655956.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e5e715478b8323a9eae9a55e7e093713/52149467385.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sccarpeti8aerlftaajnqbb9jl/golugu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a619d136676---31284425743.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_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 11040 bytes
SHA-256: bef8e551e420c768402031df344112442d2d539dd6f8645c2e9b617e5ddb94a0
font_02_sfnt_off00015259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15259 18260 bytes
SHA-256: fa219a916bdc5137128752f83a81d92b89a6d4f78a78b9b0db6ce7502a0ccb18

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