Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11e6eb53e8e17cd…

MALICIOUS

PDF

86.3 KB Created: 2021-07-17 00:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7deb643c0a2b29c46129437f9e748e7c SHA-1: 3cad7b8dd628f7e355d8347a175b810474a82bee SHA-256: c11e6eb53e8e17cd91fd767094e4ce89bd99e528f21e5ad7ab1f300bd776be17
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be directing traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lifesmart.ro/ckfinder/userfiles/files/88304075068.pdf In PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/76948368830.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c9383b4c42737d7e49ec654e6eb9a8c2/29955114540.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc241e327---28225131683.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c825f91b12991eb542f607e277504fa1/3837244870.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/28713721121.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/17084403409.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/98238892051.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0118320f2711cb426b49559cbb2fc0bc/fosufebelunidat.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa0675202---lonadigubigiwisanugefuni.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d940337619---zugelinoje.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/92770738677.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1d6474be9b62096762678f6d92589bcb/45959405833.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/55144947054.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/kegumupofe.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081725db5b7f---takin.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/pupafiwurigider.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/fowapasirewuzumonut.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/51137156280.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070523084673499.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/85628367123.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ceb0618c0---41481669328.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acfeb5055---95087232811.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/pijudivipobuvej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+many+ounces+in+two+quartsPDF 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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10780 bytes
SHA-256: 67d2e61a8a930e035e9e2d62e1558a14bf9a9d3f24dfd522df2d24ec6fda11ba
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16708 bytes
SHA-256: 701de3439bed1bd53a04d34653f965e0f2c761180574eab057fc2ca9fb617412
font_02_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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