Malicious PDF — malware analysis report

Static analysis result for SHA-256 8407cb338a4c024b…

MALICIOUS

PDF

80.7 KB Created: 2021-08-06 19:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 811507c26bd092f2595f69b8dcba34ce SHA-1: b06c23cc1dbe807a91efa712060cbdbb3c878b95 SHA-256: 8407cb338a4c024b5ae0cb692124a78d05f354e0e3d419c5295ee1f14027345e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as https://oniceh.ru/uplcv?utm_term=scarlet+ibis+death+quotes, likely serve as lures for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=scarlet+ibis+death+quotes PDF link annotation
    • http://zwickerfoto.hu/_user/file/21520612388.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da5deb27b---62337013508.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce5474487---jamawarukejer.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/29614210863.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1o85gp38n7b8i8b15e7ri00qrb/kafovurivolajurexikaluj.pdfIn PDF document text
    • http://skomi.ru/img/files/file/gupemositu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c25b5150ff---nogetitevoka.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/dijetapozegorobobab.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/31149653788.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/73900812103.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dk8n7lqts2oklds4f2l1172tq4/kupegexowinugufetevase.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a32aaede---kibijatosumufalo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/favogez.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ar9dpr8i1dvhcov1lk6n6ilrc5/94176744080.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9e0ff40568b69ae073937569d78db9fa/leporojumipox.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/ripovosevumitado.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/konarojelerepumemipukuti.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/napiwusuwopazeder.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23b691825---97057570475.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49aec4391a---nodibodafutek.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/99470219007.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/pugukutijerelepefituf.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/weterevep.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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 10824 bytes
SHA-256: 7e6fb034916082f4cf1b785cc4b00d0bf89c0661936fc67a87ee3ffd002d8976
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 16600 bytes
SHA-256: f530941add5d1e51b9eec4912ff98210069c4e98d81b8f8fe2c42e02f25654ed

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