Malicious PDF — malware analysis report

Static analysis result for SHA-256 853dc830d81691e5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b70973338d18dc013040c54678bd51c SHA-1: f960cdc467022221a266eeeedd17673a4d4a5f48 SHA-256: 853dc830d81691e5544da6df6d857dd46d1f9ef976442e5fb075393563791ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure of the PDF itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medical-1669.com/userfiles/files/85497014159.pdf In PDF document text
    • http://elateridae.com/images/FCKeditor/file/milivanaloje.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/kizafajozara.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6698311f---lixikorajemazes.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/48861310664.pdfIn PDF document text
    • https://digireg.se/upload/kemikenemazimujid.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/7722048177.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fabejapiwimukoleg.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080659233e64---20081131152.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9679795c568f0bec9d805483dee6d5c6/xusoxikuzivawejegezudibap.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca25dcf6d6---16676144853.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/xugax.pdfIn PDF document text
    • http://parilka.by/var/upload/file/xogamumunepibin.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/86061302942.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9910qlr93ptlrmnojbeo08mrj6/sabenebulegipemokemo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4c211303e9b825da8c20f73ca656449a/bamita.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9673760d---wugubarereregijigo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071751dcf1d3---34230115393.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5m09refrt87j2gq8aad7bnvo00/gawokinalub.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789631e4489---mugura.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kq3mkjg7gpb4q92p6vdmtm2jrv/topomorironasane.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rij4eaf751oihqmcnk06otv25c/94912306634.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126838e0c41a---jexelaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=alleluia+misa+antonio+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_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 10640 bytes
SHA-256: 9fe8775c6cf1074910477cf3f176621a665e087a71ccf4cd000ddc3e40f0514c
font_02_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 18544 bytes
SHA-256: 28efa0c016cb1030821269dc8648115efc3f8708b54176abd85889a5188d2a05

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