Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26f73d928e5175d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 18:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 23c594131b9c88b7fcfbbc9bb2af51b8 SHA-1: 1bc1c4e15d329e04ec858376448e0ae7036ec16f SHA-256: c26f73d928e5175d31a507065bcb2cc925d60672cfcdf35f0203794068a08b75
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and the nature of the URLs indicate it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://regiefranchet.fr/userfiles/files/37112308688.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/73012121746.pdfIn PDF document text
    • https://fivetc.net/uploads/files/figiduduwexupiwebixeviwo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/99414458757.pdfIn PDF document text
    • https://svltv.in/userfiles/files/kewij.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/39838463333.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614950f79a270---sudejivodigewiw.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/20692866106.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/zifuwibifowunuzutasati.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2a374fd0872815a41b14f3ec3fa05a85/787919392.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/65281921273.pdfIn PDF document text
    • http://raczcsalad.hu/files/mubaje.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/96379095309.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463a759dd2a---5651692908.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc3d1043e---faregorexutomiwofex.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/28242746293.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o930iuhuiii6fa3fgcchtp4tvg/lizomafesanunemap.pdfIn PDF document text
    • http://grabnerestriche.at/59571083973.pdfIn PDF document text
    • http://agilesolutions.in/uploads/19702000681.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/dorinefefajepoxotifeluvik.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/tofojumuwawutidunogom.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43e5db3ab---nerog.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/goleporibafajujadulel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=stand+by+me+doraemon+2+full+moviePDF 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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 10960 bytes
SHA-256: f7ef783e3a2a3635b9f4a8222789052df78c152e0c20c56cbf0092b4037f7468
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 20356 bytes
SHA-256: d7620caf174e2624305c855d1112f82977ff1dfcd1b634e3fda26a2cef25605b
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1