Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef230c51ae650e8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 19:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b895b3ed3a7c2eb04d02ae18057225f0 SHA-1: 183fa532c74b38f7bbd38b9383ca41b3e3206f6c SHA-256: 4ef230c51ae650e8b21e0b5d2ddf71f1395d3b5e24a0b3a03e92fb279d9ee10f
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript points to its use for executing malicious actions within the PDF.

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://coretry.ru/uplcv?utm_term=game+like+world+of+warcraft+for+android PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415b2be3997---kixog.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/zabebotivuzevukep.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/69613400844.pdfIn PDF document text
    • http://linker-apps.com/files/91632244353.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/pepafirexuxobadu.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tikijiwenafadujofo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a8a8b326581bfe12d78e6bd0c92d3f68/74056616388.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/jitisejutidenawaf.pdfIn PDF document text
    • http://zimmerei-possert.at/bogifunemiji.pdfIn PDF document text
    • https://bolahijau.com/contents/files/30012968311.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/kixomotozarololiti.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/zixabaxuguzoroge.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/wugukuvinewumalepamel.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db6df3768---tijupowezikosokomegamil.pdfIn PDF document text
    • https://lasanisports.com/files/20860728942.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/96ba7da1c04272230e62fb126933bb7c/75442982984.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/vakidijabejupabuleluwe.pdfIn PDF document text
    • http://jinyezi.cn/upload/vezirubobobujupitoj.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/47736081029.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vepabotikinovitanujilaz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/30acdd0612083db613b56691e24a3e60/gubaxelu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wefowotadefamigepukogavu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/65951282134.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/mezon.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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10684 bytes
SHA-256: 80b51654b786474065a07aacbd08e272bb5c77d0fa54217cce19efb9f98920ae
font_02_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 16948 bytes
SHA-256: 45511b13d711d474abb5aaaebefba345b5be8398052ec9a4c7298f13b7188355

Open this report in the interactive analyzer, or submit your own file for analysis.