Malicious PDF — malware analysis report

Static analysis result for SHA-256 e297a3c1ece55e80…

MALICIOUS

PDF

77.4 KB Created: 2021-11-11 19:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ff585b4606ad48e0d672e4c7c76da6a SHA-1: 3ad4df66b6acdfe773865a0ff92cc56a9f0f5faf SHA-256: e297a3c1ece55e80798b27b3704ccb049de47068b5b203e0d34f6c4b92f6cbbf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://mediedil.eu/userfiles/files/58559686744.pdf In PDF document text
    • http://shijijiaming.net/filespath/files/20210904023758.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161601977e69bd---josujitawen.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/fasam.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021101318142.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16185c998a4dde---winada.pdfIn PDF document text
    • https://posh.hr/files/37927473333.pdfIn PDF document text
    • http://osayit.com/images/file/tigomamudadevawoninugawo.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/pofabefotujotagofit.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/34144859884.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/nawoditonajamonox.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161791826ef638---jawejelubawumunifi.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109151315489268.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/93576348051.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/funaxoririnelon.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/17415653312.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/durikegegugovo.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/62320322743.pdfIn PDF document text
    • https://asztalosweb.hu/userfiles/file/mimuloruxabavibabutam.pdfIn PDF document text
    • http://cobweb.janci.net/upload/files/laxosenadelepinefabuxe.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/77082874170.pdfIn PDF document text
    • https://solturism.ro/images/file/12071131872.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26018737781.pdfIn PDF document text
    • http://lawngo.net/fckfiles/kinajuletevorijilidin.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/31178277733.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/22987505431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=how+to+search+in+multiple+pdf+files+at+oncePDF 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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 11064 bytes
SHA-256: c5de4130eee79a7bda0761e5c57a1232502c9cc973ff0d61eca5dd53e765e532
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 17040 bytes
SHA-256: 1724623d296fde85ecc84574fcde4463d36cb637569a1319f60a17c89779b6da

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