Malicious PDF — malware analysis report

Static analysis result for SHA-256 b141d612fcac7f6c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 04:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df258573280a1e6112d2d602d80d0753 SHA-1: 265f901abc62041d4699869f1f1f2ff277d2f1ad SHA-256: b141d612fcac7f6c451a7a45e7bc8966f55667b133fb3fa4fe1b477c7ec93f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://getvisa.ru/images/File/83748048262.pdf In PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mifewemekugasowilivivu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/37847161081.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/sasuwigelaj.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae6526793---norowadejaju.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/megunavibiji.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/bariravenosopowagabe.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/97823156155.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/bizuzetekamalilobel.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/visogatekeveranam.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161324811c8876---19834116642.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/tixefinutovusixovodufe.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/vuganax.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141389650a02---bigajipevufefilizavemomos.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613619e6c2614---gaxelokugexisa.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/wexozefab.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/42931011017.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/53545693227.pdfIn PDF document text
    • http://sdes.in/uploads/4219658628.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mijavowirep.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zunulekezakovudixaw.pdfIn PDF document text
    • http://chromoink.com/updates/file/35670259713.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba6448288a---19859724699.pdfIn PDF document text
    • https://norservis.info/files/files/pazixofopoferatifarinan.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/posiduzivikigovu.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210908124741.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/92074177417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=xiaomi+m21+price+in+bangladeshPDF 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_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 17700 bytes
SHA-256: aeeec61a7dc382f1e9d5451505551c5594d4bb54e9e092150ab67cdb994625de
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 11184 bytes
SHA-256: e40f0d047bcb57080af3dc65602abdf034117218c54845725fc9a7334061df80
font_02_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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