Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ee17f7559466de…

MALICIOUS

PDF

69.4 KB Created: 2021-09-14 11:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6a3403146b86152eae5f87a031c6f75 SHA-1: 4b30bb377facfb477bf5c9f6ec03acf3a0381b3b SHA-256: 99ee17f7559466de19b510370104689ddd27e7efc37ca82debfc3c87d3fd9282
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress upload directories. The presence of these elements, combined with ClamAV detection and ML classification, strongly indicates a phishing or malicious redirection campaign designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://soles2walk.cz/data/file/90427058441.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c430b93a1---witanodawovalajikagora.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/labosegefisad.pdfIn PDF document text
    • http://allier-genealogie.org/File:/wadawurawojug.pdfIn PDF document text
    • http://mobitransjogja.com/files/22676497007.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/muxadebudekurururez.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/vibolojakutetulolegokuxi.pdfIn PDF document text
    • http://4bx.pl/public/file/wuforiliwiwudoj.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/gorunofalijodaj.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/64740802969.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/fejejatepemabilujone.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/kowugajetaso.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/divox.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tbi2cg0a0qric8b41ng8mnekd2/88263295856.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b4a111cde451d5715dad4654db4872c5/nuxedipumakoxinopo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fuletifinolojefo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/1779642706.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jimitefot.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/mopojilevixejofofose.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/naroxozugun.pdfIn PDF document text
    • http://nprofit.hk/userfiles/89355821383.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/53122784100.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/1346917361.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2d3032c990df7553baa681d238d8b91d/korejedorubaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=password+protection+removerPDF 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_off0000b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 15268 bytes
SHA-256: 242022c4a841dfacedba57b1f6857ed2e2ae2c56f1d6921b406185bd89c2e25f
font_02_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 10780 bytes
SHA-256: 3eafbd89057c218fec173764509dbe6269f1547b438881f0ffedd5b342102b1d

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