Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b291d5e75e13bac…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 23:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d0f2e8a6c3354bb6a83b07b98c95213 SHA-1: 7224c56b955188e687a85cd82120e625b4dd10ed SHA-256: 0b291d5e75e13bacdaa7cfcf7671d00afa28ba4cf52e26095f1f5c0171bf75e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dotacjedlaoze.pl/userfiles/file/daxol.pdf In PDF document text
    • https://totounited.com/contents//files/furozipiti.pdfIn PDF document text
    • http://haki.vn/uploads/files/89520488519.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b28a24972343e6f8ec121fa9fb4facb6/witutenizipajiru.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/16048025609.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/6564656659.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/51909331991.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/60697108066.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kasekovoge.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/21267580282.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/q1k6bb4gl9tr4usfm8knav1fjr/noxivirexupogoz.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gsj051mflp9fclmbr4stj5rmvr/98245467178.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/venimipugojuzusow.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/podafagoxorefafopogu.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/jinuzevuvowanifuruze.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f736c425f2c---27543503015.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b246662cbbf---93969964640.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/xevewojutavevuvigek.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de28a92b7410240408dec0548cfcb6ac/gojidamusunitalulorepewa.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/xofejobufiwutux.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/vuxasadanuninixiwegoli.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/34789581291.pdfIn PDF document text
    • http://nemochem.cn/upload/files/fajipe.pdfIn PDF document text
    • https://nowtravelasia.com/userfiles/files/21262685124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=l+in+the+medial+positionPDF 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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 17944 bytes
SHA-256: 1ca6b8b4139d0a4097d26857e60377b4c4d76484159f7efc8385810bd82ae87d
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 10512 bytes
SHA-256: 6e4d1329ad2e1b3aab8c442ecb8aae0f0b44f621de00561a7e6a32af26b7d4e8

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