Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8b95badaca23de…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 08:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5dc18dff1df240ebc219327019287c41 SHA-1: d3fffcfb23b708e3d499184e07990f7114d06334 SHA-256: 8d8b95badaca23de19e5256abce47568b6cdd01e7e6bc82ac1afc4836cf48f69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may attempt to execute malicious code or redirect the user to external sites. Several URLs were extracted, including links to compromised WordPress sites and disposable hosting, which are commonly used for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=the+cowardly+lion+and+the+hungry+tiger+worksheet PDF link annotation
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161170089c6976---sekozopus.pdfIn PDF document text
    • http://ktcz.eu/files/files/41721903231.pdfIn PDF document text
    • https://aromamarketing.md/img/files/15521867763.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbadccd1a8---tasop.pdfIn PDF document text
    • http://sam-global.info/files/file/zuzolopokifajosopebuja.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/lopusivogudis.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e09a45b07---28596964056.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/pojefimul.pdfIn PDF document text
    • https://bloc-immo.com/images/16830047834.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e3rsunsk2amrg44fi19ua1q2k5/94034529432.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/kokukufarubajulak.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90108123815.pdfIn PDF document text
    • http://mfcpavpos.ru/file/86060393137.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/fimijel.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/79421370503.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ead500de---sekara.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/97819911092.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/96462697242.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tufafelukofomagatum.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/nitijed.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/26260138032.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/93754273084.pdfIn PDF document text
    • https://lapdonline.org/file/wuxex.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_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 17000 bytes
SHA-256: 66a67321c2cdf533db8f5e9134fbeeae1ee0b63d040d9d60f4506f1a7e5df712
font_01_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 11004 bytes
SHA-256: 332fe8772468eb0b2c8875d119a1114a18ae3bc9bdce99f1337ddee845c1ec3c
font_02_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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