Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf7b7df9b228c3c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f007e5f7ef4de484570ffd1b73ff9a69 SHA-1: 85fe759983e746a8b498c639e08d38eaf713c650 SHA-256: bdf7b7df9b228c3ce76e7e4bf92e5b431b8c1fd644947639a81f8f525f7915e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://3dtechgroup.com/uploads/image/files/ruxusoboketok.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140450f93721---woranawawitade.pdfIn PDF document text
    • http://profstil.az/userfiles/file/videbosone.pdfIn PDF document text
    • http://kme-kme.cz/files/file/74090100810.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/libepuwijuruvuxulitixom.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/36307111606.pdfIn PDF document text
    • https://finliz.lt/i/File/dinukomifijal.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/vosajolepevalunekil.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/gikizezuvenorufitafebim.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b288a2f1---xitanudelefejujubigekati.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/94960588652.pdfIn PDF document text
    • http://sentralperdana.com/file/jonuguxavuzemomalewakum.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/11870093389.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7963fd53---41674749103.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/pikolimogumude.pdfIn PDF document text
    • http://0932018255.kad.tw/kads/ckfinder/userfiles/files/zupojelasegulobop.pdfIn PDF document text
    • http://xn--z4qq44i.xn--kpry57d/upload/actfiles/49616447853.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jefesumamuxovizibesupo.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/77897968121.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/13701959763.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/16393748985.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/17606635364.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1615a2ee6---kokigilupebamagoweliv.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/kabaxewololu.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/mibevidagamu.pdfIn PDF document text
    • https://ptogel2.com/contents/files/vanubofulemerozolelowelal.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/62270409419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hearts+card+game+online+unblockedPDF 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_off0000b76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76D 11036 bytes
SHA-256: 4f5663f8214a7642e50639a404d70fedc69eeceb073d7be87e5006e230153438
font_01_sfnt_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 15664 bytes
SHA-256: d3ebfdfe72e878d84983b345230d2a2d236cbe079fb43cc0f87babae0a7f2483

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