Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a716ef7b6810b0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 19:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb49fc59a3a88021cba2f5aa76b0b92b SHA-1: 02bf179a6a8d83595aa905c28cade23ef4d4f7c8 SHA-256: d5a716ef7b6810b049eb6d01e2fcc2f0bb473a0d8a7e76bcc928993d1995fb56
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points towards an attempt to exploit user trust by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lagunarent.lt/ckfinder/userfiles/files/wikebajesosa.pdf In PDF document text
    • http://lideparts.com/userfiles/file/1631717799.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/76686515852.pdfIn PDF document text
    • http://standdominica.org/files/files/41460294259.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/setariwos.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/doratumaninebunoj.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/reruluzaluxomitasosowesud.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/71026938276.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/86dcbacf2b586ecc06ef655f52b1f050/zovopebefo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a022ce419c---mesukebakezodidisos.pdfIn PDF document text
    • http://japhina.com/upload/file/59682055983.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912121621.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/66529517477.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/wiruveda.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6cdrl39141mj07vop1hc3i2keo/12757573734.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/zokotugukufas.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/22140877746.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/malivuwokoxovibojitik.pdfIn PDF document text
    • https://nls.vn/upload/files/virejuripokesegiw.pdfIn PDF document text
    • https://gornjastubica.hr/files/romefavavidawuvemopej.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/62623797820.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/goliwanoladuwiguza.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fidajoleba.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/2617092555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+email+from+gmail+on+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_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 16752 bytes
SHA-256: 63429afd575030391705f4ab193553c2096cd2b97ddd48728eda3ff1d7413978
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 10672 bytes
SHA-256: 214abb730ec2f6a0b78fe904c844778d4880c1d657b7f58cd096d9b5bc2b5f1e
font_02_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1