Malicious PDF — malware analysis report

Static analysis result for SHA-256 5949c3caee14a04c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 02:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e3001e5995e934d306cc9847602bf57 SHA-1: d2ff68862278091f36201635c4f93cfeef211d86 SHA-256: 5949c3caee14a04c28317760b5ed6891648d86e017a260108f7917e16a591003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/29522472413.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc2c9ccb2---63459121659.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/16049831295.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/zanerutosogorimafajojo.pdfIn PDF document text
    • http://soles2walk.cz/data/file/80740474377.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/01953a63301b5afddc7b6d7059f3cfd9/totofewofe.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d213629680---85597498157.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/49732176980.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kafadoxatefejijokut.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/fenugen.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612d893064ee3---40459429181.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b95e8b9e4e5---86654243986.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ec2ced2c50f800bbb6148e155e20cd8a/21394600565.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ffec8e21cc3c3c7a519f575aba86c80/mubanitabaduponabe.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/rurafajovebaxevidibita.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ono9pdg8pubjp7tqrtbkl6dkqg/mosetitipipozajirefa.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/60210327361.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4097ton6unapj4bke8upi7n6u7/52399413075.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/21801147761.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/55014766263.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210629_78B86FD656FF397D.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gakizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=skulduggery+pleasant+11+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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 17412 bytes
SHA-256: ad62a4d916e78f9f2d7a6c8e1ce70d30fb696b75a65ab72c2d8a84895f2d541e
font_01_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 10896 bytes
SHA-256: 133eb3b04a6de95fcd5e4ceff5735d11c426c4d466e704bc12d8edb54c21dd69
font_02_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1