Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e547d8d9bc483ff…

MALICIOUS

PDF

85.0 KB Created: 2021-08-16 10:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16768190023e771ad3efb49be0e39e5b SHA-1: 321ccefd9066338172cd34ed8145345e34b39a39 SHA-256: 9e547d8d9bc483ff0a158c2202f9b9ae958c90082e3156e2cf8bd07df87896b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8f18e808318555e5e49ceeb9e5631dde/zuvufojexukovagalefuni.pdf In PDF document text
    • http://royal-pizza.eu/files/file/61461619053.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/38591100049.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/47290448161.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bunato.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/widaxa.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/69183481276.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/jovinufewivugex.pdfIn PDF document text
    • http://naucseto.cz/storage/jelabatakoligavasifukidu.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/bigobegenuvafepi.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/telulili.pdfIn PDF document text
    • https://wrd13.com/force/file/binipiloxufunosare.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/g1rmev3dh556b42s9ekvek31e6/zugosuxop.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/936085354609fb67d24b00.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6a7c3bc7---48338830695.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa8b2ebe8---7809737628.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/de179a1c979956f53eac5d903b5ae568/67779368184.pdfIn PDF document text
    • https://autopratichesas.it/file/puvuz.pdfIn PDF document text
    • https://artenika.pl/fck/file/wavege.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/44786069871.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/mefaziruniwuti.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/pigaxag.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/dozolomoxupalojusakotawo.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/gotivopalexegepumobazu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4aced02fa1ae7206a78d2a9631755cf/ketuwot.pdfIn PDF document text
    • http://skupka54.ru/upload/m/nafoxafoxigugegegosemeboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shimano+altus+c10+shifter+repairPDF 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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 11096 bytes
SHA-256: 59bbd0c54c8ca2c118041975fafceb7d763e9dad4b6b906245496d73ba5bb4f3
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 16364 bytes
SHA-256: a48dfcbd6195fff40369a227b0264d582b381ec7e2d71947b7fd2c966a576ebf

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