Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43eb8e526660da1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 01:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 769dac58ccfa7dfcb3cf74a4d955aaad SHA-1: e3871676a3d2f089525f47661c8ad7f582b3b53b SHA-256: e43eb8e526660da186bd799d7997f87ef812c871e05f355d1ece5c788e615039
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to compromised websites or disposable hosting. This indicates the file is likely designed to redirect users to malicious sites or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=mario+and+luigi+partners+in+time+ds+rom PDF link annotation
    • https://zlato-eu.cz/upload/files/duroxaz.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xarivabaxudovasovoni.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/58947512861.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-21/20210921174649901285.pdfIn PDF document text
    • https://birotex.rs/images/files/21240142715.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109061834302123.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615106d34f34a---xajovawutitujixotig.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210919_FC2E6ADA22352867.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/80498470618.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/dotekawosinefivelajoz.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/16390142204.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/monuwawul.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dobekedojovagol.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/28520476567.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xubugikepef.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/62246484813.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ae5c1c50---20743459312.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/73384584483.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cda52fd8e6ba01bddfc3da49d9a1862a/wonugureregolazapufaxaf.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/32dddfc2ca05f2b12479cefabe5dbeb7/58818141286.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/tofowag.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_off0000af8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8F 10828 bytes
SHA-256: 5c6247fc0ce8089135f263b555de2be4ca67932851e4a4802282eec86faf0863
font_01_sfnt_off0000c84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 18196 bytes
SHA-256: 1363e045588040aae80698ed3d1912a2637df2220be9f8ef9d80ed8f2355875b