Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53313faccec8eb4…

MALICIOUS

PDF

78.8 KB Created: 2021-10-12 02:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 798aa90bf5cff0a42a4bbbe9042e6f0f SHA-1: 09f4207558cd75e6d9ba6976f0e9ae6c13d06c97 SHA-256: f53313faccec8eb48e63689a755e4e7d7bffda9a1201e20439280dbe83e38c08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it is designed to lure users to malicious sites, likely as a first stage of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://s-privod.ru/userfiles/file/11707178114.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/lisaduximaroguzotosasedub.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/fidopo.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/68560100320.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/86469307199.pdfIn PDF document text
    • http://hexindechem.com/upload/files/ravosagifiwevuzuwapazitij.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/1928171550.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/27323730430.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/af0930c2c35cde24a163b37c7b63ad06/25100872762.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/dozotixirixag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301393004b4---83296676897.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/72642832315.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/26074945022.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9b70ac08444d71e5e3de1ea864f8d8eb/xukutizidu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f73e496b77.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/84186733854.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/soluvokuzoroxubuxikof.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/38532933840.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/44514827563.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/lde6mdg2ch67dcul82q1ielmu3/bokowapadexulasifinit.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/60533989114.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/nosetesavivinanolip.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=mechanism+and+mechanical+devices+sourcebook+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_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 18512 bytes
SHA-256: 3aa77d85503676618e7b07c79e8745f908c5f6cbe86bd43f7ef766f972ae09e5
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 11176 bytes
SHA-256: adf5516c051d5260c6e6c984a19cbb1363842d4a8c73fb48e7862fe28a0beca5

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