Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2bcbbc2fe53425…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 08:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39d55aea77ef60053d71f002fd548446 SHA-1: a777096b37c47f86f1702d5042aa0adf08ed8637 SHA-256: 0e2bcbbc2fe534258c7b3a32a66ecf3b20911a25b5cd5a8a48e25e622ee361db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with at least one identified as a compromised WordPress upload storage, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://meijialx.com/ckfinder/userfiles/files/18277104837.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ccc03bc---13665330147.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/gerajezegep.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/93919648729.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3884ec5b3---74550814520.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/levigotipebulamisevutatex.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/65282297393.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/dokaranidevaken.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b90acd002dc---96177104229.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/15343489182.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tth45k0kjh0aodkot9bk24sl67/bunijal.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/37422158605.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cce412418a18b29c8e3d1b68770529d9/nekejeburonune.pdfIn PDF document text
    • http://sungder.com/upload/selefawenozasiwuvuliri.pdfIn PDF document text
    • http://jngf.cn/files/file/47689135451.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4adbb6ce---90360534959.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/naxarewep.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1ffee3d57271900db67c6b757996af98/31903631394.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/woguxazeriwonefanekegotaw.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/moxobibume.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f311614c---dopor.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/gikigulewu.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/1420956245.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/216ea8447f69ce139b8f2dbe51980cc7/zofuwowepofivugijod.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/nukogorarozag.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/42213949365.pdfIn PDF document text
    • http://analhospital.net/file/files/gazexezased.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=strategic+human+resource+management+journal+pdfPDF 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_off0000bf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0B 11372 bytes
SHA-256: 320e8f382462df1f7d84bbf5d0ae7419e833c2f5add44377c6c366d03ea3dd62
font_01_sfnt_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 16708 bytes
SHA-256: ec3cfa88fde2cd2d4a593fa8023d26db281f1790b60ce4ca4f5fb0961519787d
font_02_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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