Malicious PDF — malware analysis report

Static analysis result for SHA-256 6314f5a7b2ea1d57…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 14:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7deec1eb4943c3c775a799d82ebd82c0 SHA-1: f2dc22bb0e56e5a510b928355589791c88bc0290 SHA-256: 6314f5a7b2ea1d57057cf22ca3c3eca75e3fb7f396058b0e018d58e5266ccfe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The presence of multiple external URIs and a link farm indicates a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135e64b46061---fijezusob.pdf In PDF document text
    • http://ohana1bbq.com/uploads/files/nirobebejubevitogara.pdfIn PDF document text
    • http://rhondachem.com/d/files/24868707801.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614118ed527e7---faxajiginapalemugegobok.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/77733144393.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bezubu.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/89110465815.pdfIn PDF document text
    • https://hobbypet.cz/files/file/39580741437.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/kabilixe.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/lujivarulezegopagate.pdfIn PDF document text
    • http://baove24h.org/upload/files/turikonofanujefevumik.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/37834936624.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/10052168472.pdfIn PDF document text
    • http://freetds.net/userfiles/file/845973000.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/915785817.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/78144074617.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/32973279286.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6b83d658---1293177136.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbed7d6a0---nepabelarovezud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69ab14b73---bosowevelegapamapasoz.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/doporajipova.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/jiwefituzibazotesasa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a1fa444dea24d46dcce59c1db66234d1/tolixosinedevawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=messenger+app+download+apk+2021PDF 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 18024 bytes
SHA-256: ec427c5d41635bdf4fd1762fe9093c878bf328ddb9947829f7073c75d8b45a2a
font_01_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 10844 bytes
SHA-256: 48b0dc2f0072b5b1f5b74a35f22c5a48ae5f655f59f93d38faec7b712cfabfba

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