Malicious PDF — malware analysis report

Static analysis result for SHA-256 402ba6335563cd8b…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 17:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 837e1c6035b986f67eb30a7141ddd3c4 SHA-1: 572cd9e99c275bfe8171c6905d9e3aafe7935420 SHA-256: 402ba6335563cd8b6730f18694c4eb13b3f55f7d6b0dc6f3a3eee110d17afd1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://funcarele.com/ckfinder/userfiles/files/zovikuraxozanuf.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f3c916298e8ef1c250f06c5c57dbcee3/9254107539.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/tojamejeg.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/jesutegawibuwofenulamug.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078aaae573b0---25608966943.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e72798ec2337b6633af63b541a249504/45549638447.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/82297345917.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/82eq0a98b989iq26fst3skg5ca/69632124253.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4667292d988108b413a33da59eea0cf9/32934909152.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/20655211796.pdfIn PDF document text
    • http://ubest.ru/images/file/80733537895.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/95345842749.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8db3bfe34d6cfdc00aeba4ae0f76f867/gitakekozovulemurelide.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/63848932762.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e4c26bffb---fomiribigolivuxibijabe.pdfIn PDF document text
    • https://congchung7.vn/upload/file/64734962752.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5893f6a5---95940914228.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/dawudesipageg.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/19161141364.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/93280853723.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937580e7d6---65937272058.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/nikalow.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/17959400363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=all+right+all+night+songPDF 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_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 10236 bytes
SHA-256: 974caf1eccc985f187ce9e84a7f9e1e8eea5054fadf9e316667cac19468618fd
font_01_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 18576 bytes
SHA-256: 2f2f26eaedf7edf08b775ac73304fdce0f97b954db9ec16a06b7bd80258c1728

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