Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa591345730a88e0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 23:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb07721162baa803914d3b6d8487c960 SHA-1: ec9f03e85e6c587d501dea088125a3a50e4da308 SHA-256: aa591345730a88e0a56a966708fa598ed5c135baf5e89d8ed07fe9a422c4d335
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/043e24341260b3644393a5856324308a/83125583912.pdf In PDF document text
    • http://randoquad72.fr/userfiles/file/23166079603.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/91193797447.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161315eaf15de0---badomiramu.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/29516289176.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/mifipuzapebotawirenumaj.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f10288d5---43977231011.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347615887e8---gekasokazefemefim.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/rewijelozofenomuzemi.pdfIn PDF document text
    • https://il-gusto.com/images/file/76328971466.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37143856017.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/43033350626.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/84012963274.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140f42d689fb---momomedeg.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/55708994777.pdfIn PDF document text
    • http://www.andreapondika.cz/file/rubemakogamulegigi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/82434172498.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/pijurid.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///tepaka.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/lomunavalilaki.pdfIn PDF document text
    • http://dr-temt.ru/images/file/vafide.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zetajusafibela.pdfIn PDF document text
    • http://rilta.net/userfiles/files/kexeromawowexelazek.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/rotopedafun.pdfIn PDF document text
    • http://asoriofrio.org/ckfinder/userfiles/files/mafolidoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+fire+red+androidPDF 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 10296 bytes
SHA-256: c2de44b6e0eeea4d5eea28c54d999d50364e7a3e16474f735a97eeaac36c72a4
font_02_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 18124 bytes
SHA-256: 5d035642956b28cf0fe78f5b6955aa368246d4ee555756cbcaa56f789ddf3262

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