Malicious PDF — malware analysis report

Static analysis result for SHA-256 307f8afcbc01b4b1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 00:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67d83df262e1ccebafde0d3719160797 SHA-1: f37abe2424eb23bf161e1f31dd52f01df7c4802e SHA-256: 307f8afcbc01b4b1757206b53b98d13444620073d163b59364a79f48334300d7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The primary function appears to be redirecting users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pomodorolennep.de/gfx/userfiles/files/zoposu.pdf In PDF document text
    • http://neteyes.eu/editor_up/raravo.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/putubowiderezufokomew.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/42452508067.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/48123192775.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/12497368023.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/91459749091.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3ab282d1c1d52c7d6d28316c8da1af14/bakoruzovodepes.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/65809147122.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210906230643.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1a23d0b10cb0820fa94e7e450f913492/duxelupara.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/42951057698.pdfIn PDF document text
    • http://oodow.cn/upload/file/21090809585188799241tyiclsd3jv.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/mupesovan.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/66985394013.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613407d6c95ec---54586953875.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/datemuse.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/26446136509.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/93481162108.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/76620362379.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nisakakoraxaz.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210904194624.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/gaxugitabo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bb573898924cdd203ed88facd690a9eb/dotamevesowejo.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/lufogokariva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ice+age+movie+onlinePDF 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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 10224 bytes
SHA-256: cd62c076b9c641bea65c1e0573c65964ddd013155a8bb6c0e8cbf5a1e49534ef
font_01_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 18440 bytes
SHA-256: cf7b87abdd98d506ee11634e41a3799c43a1e17c3973c552b45fb99223a90b8f
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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