Malicious PDF — malware analysis report

Static analysis result for SHA-256 f030238fcb586115…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 21:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 518fb42e0b3f0b5090419e5316d55e46 SHA-1: 3c2852f853fd08bdd2f7e69f45896332b24560e9 SHA-256: f030238fcb5861158aed65bcd013ccdf7f0889266ee16c4d4b7415f3bc986e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://alexdisinfestazioni.com/userfiles/files/65364797367.pdf In PDF document text
    • http://bellina.pl/userfiles/file/kutuvuri.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/84903539811.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ba8c3634683fc75aecad72485da5e1f8/wixezow.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/32e7165073dbafb70e6261cf9e7e0a17/kokapilivolese.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161523ba30fa2f---puvapipukolaxofoxotuti.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/14282616026.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/susodufuta.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/bonaripemadosegepobowuje.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/todegivajuleradiloxalo.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54400739094.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/94193608043.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/38956795782.pdfIn PDF document text
    • http://keramann.ru/uploads/files/lusulivosen.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc0fe908b1---dedenu.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/dizesil.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/vagasefevali.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/30965579124.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915686ab59---56369480512.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/77989685231.pdfIn PDF document text
    • https://mcsfood.com/images/file/47759324418.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9m7qff4pme1n1d7gk4a7bh9g2f/sapenomawujo.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tedelufiwojinofanusevus.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109100438079815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=simple+resume+builder+for+freshersPDF 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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 17360 bytes
SHA-256: 56660e2d4a3643385b7a3d37aa58582fdae10b3864a7b896732cc984db87a5f1
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 10716 bytes
SHA-256: ef2f6a72eb49063c00ce46be39c4f52918b9306c61968fe2bf9b2d29a8b86abf

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