Malicious PDF — malware analysis report

Static analysis result for SHA-256 676bbff1f7d81221…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 00:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 840389cc7795e9ca0122c249a5839994 SHA-1: 847ad0fe9ae496987faab54d38eb53a69f835cd0 SHA-256: 676bbff1f7d8122181495e20ae97bec43a10b21abb726a44fbd5722f04f0c04f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to PDF files hosted on compromised WordPress sites and other disposable domains. The presence of numerous external URIs and link farm characteristics suggests a campaign to distribute malicious content or engage in SEO poisoning.

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 https://catamma.ru/uplcv?utm_term=beyblade+code+in+game
    • http://cgemfoco.com.br/ckfinder/userfiles/files/viwofinapo.pdf
    • http://morpheus-architects.com/file_media/file_image/file/wabipe.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/xarowekale.pdf
    • https://excellencetogether.com/img/files/file/jetapokaduzedi.pdf
    • https://superpackeg.com/userfiles/file/40675861009.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba0105b23b---pimaxipizejoriragujojizo.pdf
    • https://sesconbs.org.br/ckfinder/userfiles/files/10795165267.pdf
    • http://alrabbanoilandgas.com/file/files/97647315920.pdf
    • http://jjw-led.com/userfiles/file/pugivebanonevepeletitatax.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/41638297749.pdf
    • http://faceconnects.com/ci/userfiles/files/pumuvi.pdf
    • http://vinhhangvien.com/upload/files/kosoxa.pdf
    • http://tnslib.tools/userfiles/files/wepixorurefurokizikaw.pdf
    • https://badanie-wody.pl/galeria/file/38583678116.pdf
    • http://fornacedelia.it/userfiles/files/85222343227.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d4422c89aff8b59058047c800d37001c/50030896344.pdf
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lemutatuxipu.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fa0001ba3---84405198641.pdf
    • http://stroisvias.ru/userfiles/file/64768035301.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/divodasubuworut.pdf
    • http://www.tekkoo.net/images/library/File/59814870230.pdf
    • http://haithuanphat.com/uploads/files/puzulazokivig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d422.bin
551cc51885098dbbd222e115ccf7ddd651f0eadb498d36631caf4774b7139f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 10652 bytes
font_01_sfnt_off0000ec44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 16792 bytes
font_02_sfnt_off00010456.bin
1050465bf9d61ff6225d5af3329fcce0b5cd88045fa724adab9370f62d02d859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 18400 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.