Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cda8e678d3b970a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 21:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bdd608ec7e57254693a00863c84d77d SHA-1: 5182c26be1c1e51c618588a481a704e4d4573a20 SHA-256: 6cda8e678d3b970a47b7476348b7fe8dc5d5f7de9275a6e6fc43eab2cbfc9f89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://i-chat.tw/js/ckfinder/userfiles/files/dukaxadipinerirofixijowuw.pdf In PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/pelolaxofavele.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613695d9e6c1b---27219537467.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/jabamoxumujuruwedel.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/61490968498.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/2691827623.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/kafadud.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/522b6a25f9b6cfa6a8bbfbfb62bfc9b9/jugobodufawizelakexiw.pdfIn PDF document text
    • http://24cvety.ru/upload/files/39041814992.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/38650004661.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47cb51958---15328516577.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ibd21g7u965i6r5cjcu5tbne6p/73924091533.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vojekonezufukarozorutenof.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/62522710831.pdfIn PDF document text
    • http://canoeing.by/pics/files/5240301731.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/gavuxufiv.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd8d1d7cbf---xazogujudajikagusafumopi.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210907024928_olgg42.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/20666582644.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/litugiguloluban.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2374972e771366ece345637b6f924ca4/bugudipinumukokaf.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/48171133297.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/46722180055.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/fexiwavuxojoporaxoju.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99c70bf81---78736824326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ff7+android+cheatsPDF 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_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10556 bytes
SHA-256: 7c9e1b4e2f09a1fe98961c2de259d12b3e3c601b01a2d6d5014d764dae6641af
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 18624 bytes
SHA-256: f2521cf9222d53d676003176e6a1f81a181f3ebc64d46195337a6943ad13df46

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