Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b9c2b34251b658…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 00:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2b28675451293d5fa06132d39eafcdf SHA-1: b031bf248b6cedc2a1e3189e8669cf96e56c7d4c SHA-256: 08b9c2b34251b65835c193e745f20ec6b26552619df4778e6ad0317922877160
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV detection confirms this assessment, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=big+win+casino+lucky+9+mod+apk PDF link annotation
    • http://robertoantoniz.com/resources/original/file/lumiwod.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/sukem.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210912_3E938CAC46708DBB.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/siwow.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/92195056974.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/tumelibolowor.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/sapimukujozo.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/zedazugu.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/71982637561.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/sukububusi.pdfIn PDF document text
    • http://montesantangelo.it/files/files/xumukarupoberuxifaxemen.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/fetazejiwunonojagosazub.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312bb5dcef2---13149630868.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d88946a---dijajebitos.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/69348396895.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/xejigizotinawapekev.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kosud.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/9128425560.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/25742595709.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/25754472778.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/binuwosu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fozesofigebitedoziwogos.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6dbee16eb---76276068692.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 11140 bytes
SHA-256: 7905af06ac9ede33cd0b9eded8c44f2097302616702d63fe7402d13210afe27f
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 18588 bytes
SHA-256: 5d54e063088cfbfc22c2b998286aa8032882063b0c7566b96734b8dd46f959b1

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