Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c6dea27ee055d5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 21:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d6e1b1c5cbf85136b04bd56ba7dd268 SHA-1: 7c0f8b62fb56efab8271ca88282dcea042d050dc SHA-256: c1c6dea27ee055d5e0f84e2faf4eb459359b881ef22fcfe458737d2bc23308e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://smidgel.ru/uplcv?utm_term=joy+to+the+world+three+dog+night+sheet+music+pdf PDF link annotation
    • https://hkbca.org/UploadFiles/file/20210807140158100.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/95419631911.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nipetuvazoguvesefiseb.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/7414318390.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/fesodurasivezufagetivi.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/wiwexitetirigovekosok.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76af6cc769---67890623363.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1aaa3ce34---13483607962.pdfIn PDF document text
    • https://mbbs.hr/files/71189655053.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/xokofuxuregiwibigakawugot.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/86402511735.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9855bef02---92995699121.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/rifodararifatupobuxipuw.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad372e7d40c---sogowutorisexiji.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad6381d10---53866061994.pdfIn PDF document text
    • https://xistenze.com/files/files/lireniseselizotunotaxaso.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b76bc420d80---7559756446.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/64919078865.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/kimiruvasuratixerawovu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074543c235f1---wutofusuvadaba.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072682589087---rejumixelolanitili.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ce4d8945d704475eef3f0ae3e645836e/71504979242.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d00683f42---bulaketelexaleguw.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/xumukikoxixinewemomon.pdfIn PDF document text
    • 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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 16552 bytes
SHA-256: 53d7603de27b4b0687b1c965508ba1296b050e6601697c7a3b9653b9001d67be
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 11196 bytes
SHA-256: 6b53a5283c0aa7e3a8773cf8793b55cdbff763382f500388f915d5afbb74e4ae
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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