Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe38a2f99f06161…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 19:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6c8aed47dee51fc5491e69b014701fd SHA-1: 7ef5403881211688dcaeea58f84b32d4712655af SHA-256: dbe38a2f99f06161dc81c80de342e92396887bffddbc337e27eec8b7dc941df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=cardiologia+de+braunwald+pdf PDF link annotation
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/27187389685.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/5008945231.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/83786469759.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/58546368586.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/jupapawivukozojirem.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/kagazatexu.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/75507063479.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/tajurozajajagedudom.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/pesagiderowuxipopejanopi.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/86081177442.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/xaloreg.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0365030d400e6b6bf3cabe0f0784fc38/35439130823.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccecd2f257---72324088560.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b96a1da6e2---ruruxuxinezanutowuxidafu.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sazasanolaxa.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/mapofife.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/mabezorejig.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/96927791816.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/nigujoguzuwetukutewo.pdfIn PDF document text
    • http://banquat.com/userfiles/files/71183986735.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/79897125613.pdfIn PDF document text
    • https://onlinendttraining.com/files/84800359264.pdfIn PDF document text
    • 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_off0000b636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB636 16560 bytes
SHA-256: f4c85e30bb44297efce5313de8b2b1b838a6d46fdb265dc16a74fd9600056c4b
font_01_sfnt_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 10764 bytes
SHA-256: ab1195b0880775b89af0d88bfb8bfd38c08339eccf08959c20edebeacc6414d0
font_02_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1