Malicious PDF — malware analysis report

Static analysis result for SHA-256 383ddcc43c1e153f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-30 15:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e13e3d98cd4d196624e5ee02c09cc147 SHA-1: 8961f411debeeacfdb2ce27500cdc2315ac93792 SHA-256: 383ddcc43c1e153f368ec16b6c5c79134d694a755d2e1062d6f3cfbff970bf2c
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 within documents. Multiple heuristics indicate the presence of link farms pointing to various domains, suggesting an attempt to obscure the final destination or distribute payloads through compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=mi+a3+themes
    • http://e68momo.com/shopadmin/upload/files/14924157725.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/37001531578.pdf
    • https://mongolia-volkslift.com/uploads/files/lanakasigivebiru.pdf
    • https://petrovsky14.ru/docs/files/34982832905.pdf
    • http://goodwill.as/userfiles/file/difudimogenetimefadisud.pdf
    • http://szyuangang.com/UserFiles/file///zurebefevusedikenitekov.pdf
    • http://vlajamo.cz/images/file/37312327666.pdf
    • http://belovosushi.ru/files/dobunatupidibari.pdf
    • https://fejlesztes.codefon.hu/js/ckfinder/userfiles/files/xisidu.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e362119a---25684688213.pdf
    • http://konsultacjenaukowe.eu/Upload/file/21305056870.pdf
    • http://brkvinc.com/userfiles/file/dovatonez.pdf
    • http://ttc-investco.com/img/files/69604531453.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16145c4112c0bf---lisorotiketulorodegijikuz.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/18941327602.pdf
    • http://velapower.com/glwh/UploadFile/file/2021092919140873499.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/1775680588.pdf
    • http://yesilderecine.com/admin/editor_resim/file/xidosegelim.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f8744369f---90053145921.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/46825997668.pdf
    • https://reformedgeneration.com/userfiles/file/sulexezi.pdf
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/64152149160.pdf
    • http://topenglish.sk/app/webroot/gallery/files/paxaxuvekiwabanasami.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC87 16792 bytes
font_01_sfnt_off0000d499.bin
39604851f3571caf6cedd206434e1d8f4cdad476f39fd6892646b5e269ecb1df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 18688 bytes
font_02_sfnt_off00010541.bin
3a8d6fc8efa9e8c2c6f52ac040c822c8f0c9203901243d27b04c775e0788e89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10168 bytes

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