Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecabe1df6dcd3d48…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 02:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4318e7b055c44f7a18b308e8f69b841 SHA-1: ad988a4a3c6d4da3b68307d11a62d97fab2f4bef SHA-256: ecabe1df6dcd3d485de8d30d9ac7c97120da71f8ef55aca4954b7495c3d4b416
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The critical heuristics indicate a lure for recovery secrets or private keys, and a password-protected archive, suggesting a multi-stage attack. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://avenue102.com/uploads/file/34286788233.pdf In PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/71643213451.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vimijuloxupakafoxafev.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/13000248202.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/41614074012.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/65763122070.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/75256980570.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/getejef.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/gugenafuxanos.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/188e4dea8e4eab28bf5ff8c1cdbc53be/donikimofawatisuzuko.pdfIn PDF document text
    • http://ud2-140.com/files/49875792416.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908073401.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210910163707.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/worotop.pdfIn PDF document text
    • http://kant21.com/userData/board/file/xaliwuxinafitora.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/9495111926.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/66237897202.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/21354579412.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vojugozejabovaxagepep.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/relesomewazebex.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/24b40723ec6a4a30c029a0566b5b103d/vonijetexezudokagotamik.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0ht3gtpem1ui4lm6f7vtj6f124/73009629414.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c13bd18b---38996604877.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/65599674843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+swype+keyboards+for+androidPDF 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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 18880 bytes
SHA-256: f4290401905ddc58e1138433da0f528863360068f8bed1bfa9f0685417d4e945
font_02_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 10756 bytes
SHA-256: 4e13b1dd01454368719d226163c023ca5ad66b51425087579f2a9a4561a33b7d

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