Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cf1af0d709841f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-24 17:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac55e0a559c84c7c746f177db5c44267 SHA-1: a57a843645cea231cf40a44b1c7727163d8e3aaa SHA-256: 07cf1af0d709841f5acfbdb4450a9b92cc856903cc8e67a6ccced075d9b92c02
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://yunnanyingxiang.com/ckfinder/userfiles/files/lukesuzejuzilapipusigul.pdf In PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/fezinirinefotizidenunuref.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/naridibisaposimuw.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/modima.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af45a9737d---gudiwejegive.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/kowedobobovixubiwafoxati.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614016eae0ae4---4360037511.pdfIn PDF document text
    • http://sdes.in/uploads/dawuve.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/kikefuvokabutuvelosi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/vipejiw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q91qlean6hm2dvp9fs12r2ngv2/sujonilojen.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/kivedikonawulisepavax.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/39803149522.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/laxifodup.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/86334553052.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dasitoso.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/62477229947.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///91666377887.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nuwexogogilebovozukiweta.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139a6b61e5---12540307940.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/47043026540.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/13528362270.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/34754947186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=salin+tv+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16240 bytes
SHA-256: f21ce2553d32d31bf3a4524ed4571db7b34a54eee3aefae9e84971359bef34df
font_03_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 9956 bytes
SHA-256: cf2165d027d13a9d312e11a291f23ffbd82096a6f1b0fb52638fd64c3a02257c

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