Malicious PDF — malware analysis report

Static analysis result for SHA-256 5782230305c45cf5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2b996a1c750ceb67901bad46005f881 SHA-1: 9e0977f4d185050ec894306da2797f1477d7439b SHA-256: 5782230305c45cf50ae080f320da1d9019f9948d24ea0cbec79187e5f1d20329
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lookkorea.net/userfiles/file/sazuwimetu.pdf In PDF document text
    • http://abnicum.com/files/file/86469846012.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/93232beacde9aca5ca15a9d7ca8bc3f7/gefavitusumesunikonorogo.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/98566182562.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2282d34f3---nixibuwewebarirusi.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/71060464496.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/63090548184.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/95624721134.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/guu0fro8som56digluqlk9g3q3/19172477086.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210617_124656.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/31173493842.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/makujipotuvexizozegazibes.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/lanirepejigamobawepiro.pdfIn PDF document text
    • https://numberonerevolution.it/file/midivademotidofajok.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/717463693b8827af461cd8e1020defdb/91452670195.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9b7ba91204b53ea74bc1efbe5f866303/85544471106.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/gafafudikemuvetulifoj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48609f4a1---dakunesetutoza.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/35409535176.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/594t5h8i42jtquutda6c1aaft7/27770557285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sun+accounting+system+user+manual+pdfPDF 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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 17476 bytes
SHA-256: 4f0bea67b88df6a62da895f1e6b5a78a82f5b45763a183016b739d8b6cd641d1
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 11252 bytes
SHA-256: 6940ed1e02c060d4df83c070661e9c64d9c85aad3485e8e5fc689495718fa5f8
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1