Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca89082da19c95f7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 19:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0145b3a17a300a4e78a4b6e5bd503d7a SHA-1: cdf617f2d117d50c68fc44c34d71ccb713ffdd4e SHA-256: ca89082da19c95f7de634d51499107246b7edf54aba50eb661d93d1fdc44c621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=what+is+uri+parse+in+android PDF link annotation
    • https://cyc-catering.pe/disac/userfiles/file/motizoguku.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/lidaseka.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/65094378639.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/guzifovajukiboxunibat.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/34076309096.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/novepafalejusixib.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/vuparinonow.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/gexududaka.pdfIn PDF document text
    • http://artepcb.com/upload/files/koxegadolosipaxema.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/90366163286.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/sipepojopuvixebiw.pdfIn PDF document text
    • https://kermanrooz.com/img/files/20658997184.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/boxavizidabeweriwuxov.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/sogirokowu.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/54198523296.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/jolutadizareg.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132945daf4d6---14983765459.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613026edf1956---3815949894.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wumufuzo.pdfIn PDF document text
    • http://chinalabware.es/d/files/15529586766.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/nafupu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6tn4jsiag54qb4atibr2bsdgh6/57444331495.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/47330343007.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_off0000b0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 15304 bytes
SHA-256: 5ca2849ee34ca0ae376c7900134b7ba26719354a87dedc9d2e533b9fa618afb2
font_02_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10536 bytes
SHA-256: 9e91f0ad8939ed9b6fcb9caf9efff7a464f64c45244e602181fd736116dfc4dc