Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2d899dc0cf63ae…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 06:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6880ad30094a3b6c0c6893bcf25f506 SHA-1: 7f6128c6289b168a3c3a3c1a79c247cb91813d5b SHA-256: ee2d899dc0cf63ae4901b19ee0463e66a8e2dc8364b2c3700e759a24af3d48e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites 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 delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

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://synerhu.ru/uplcv?utm_term=hatfields+%26+mccoys+assistir+online PDF link annotation
    • http://aquatherm-graz.at/files/10571090456.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/kisuzogimipasesazan.pdfIn PDF document text
    • http://ha-sine.com/d/files/bavijowuri.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/povafixelomas.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/95663909074.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tubavaj.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/dijupiroseg.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/fuzijoworake.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/parosukapelomaw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/09195349916.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/lefakemug.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/janonokupaj.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/37176137970.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132e906941de---55613976651.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/16564731340.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/54544878513.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/xutagepudani.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/fimugajunuzikiv.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9ed8096368fa063cc903ef6928ad1c16/92124546322.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6ff815a5c95f75ef33741762741e07cf/9621766923.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/pamogupipotitowoninijuv.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/xogilinolibafizirix.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/zusamanatukawetigimopi.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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 10008 bytes
SHA-256: 51773e1412922c3a7e9b56d6ded3c6a71a4775c5a12c52a039af658c4af9b433
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 17880 bytes
SHA-256: 8572c7e52fa8cde7b3f527d418b1dc0469a558b13a398f4c1ac9aaaf9d0aea84
font_02_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1