Malicious PDF — malware analysis report

Static analysis result for SHA-256 516c9860f4194b95…

MALICIOUS

PDF

84.5 KB Created: 2021-08-15 21:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77f0b48f19ad0f214db8e0f0831ee86c SHA-1: de770733188600a6f4e7ba6049156de8eff39706 SHA-256: 516c9860f4194b953b5fa79ca3280f6885e1b9826dcc6db4630ca93c8b699756
196 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick users into installing software, a common social-engineering tactic. While no scripts were extracted, the PDF structure and numerous embedded URLs, many pointing to potentially compromised or disposable hosting, support the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://worldplastsolution.com/ckfinder/userfiles/files/24087919789.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/94436342419.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/6044272698.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a4478060---zederejamiz.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/58120962923.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747ee0921e9---jibufur.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/93739973773.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9ba0c126fc1de76414b6a440d37a47ac/39919385497.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zivisasesawa.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/10689603562.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609263d730b37---vesutaxakojetugubudag.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/feteregube.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/92225565552.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994e155d93d---tatuturotibirona.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589a0ace42---74564734017.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/lalazexebudokidotog.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/gutefufabuladudi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3rogg56fe937c02dgemrm2cl04/23962823260.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459ee9465b---zivulimijozefo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607763ad9c74a---jadojupirasidoduzaw.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/66411245217.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796facd17db---funetobugipi.pdfIn PDF document text
    • http://abc-tel.ru/data/File/63124130280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ap+calculus+ab+lecture+notes+calculus+interactive+lectures+vol.1+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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16732 bytes
SHA-256: b105d1f820e034477226ce5fec638035e2b066f7b6f36cb857c4ec395611d4f9
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 11016 bytes
SHA-256: 33cc4ea75c2ca97a07466b9dd920f3af0a15c7063400d885a07f22389fd2c6d5

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