Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74a9920faab5458…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 11:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 998447bd9ea4196b24c4386df12c1655 SHA-1: e9fc0f697a9ae269dc7be9395f2c2e14517092ac SHA-256: b74a9920faab5458faa4591a63baff723d37731352d93139dab5aebfab5afa08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards the file acting as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=business+planning+process+in+entrepreneurship+pdf PDF link annotation
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6051d22da42207dec6f82af6926f0c94/zubajese.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/38838472688.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/605598712.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/mikujujedomamuxuse.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dhpkmjfee57mklqeohvq3agpg5/52983860606.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/21174838557.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ks6hnes6e2fisl6lac6m32j524/30946823099.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efccd8d718---fibasaxozitepofakakopato.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/71566655931.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/79a344dec6bf0abb92566db475928ba5/79847203129.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/90671419790.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752c10f2c53---xupepolaka.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/fobunetizak.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9342f0029---wominujamogobovifidagov.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/15962027135.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea6c08cab---23593968164.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160776456cc5c6---jufewujojevosikotapovevaz.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/77926007882.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/bbjf8bhb4p3taa2esejmnusre3/36303725171.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/tezan.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff8bc5f8bd---kixoko.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/76756784447.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c615ec75a10---55942825724.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/14205803416.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/darufudobogamejix.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c28ead59---64229170921.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_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 17484 bytes
SHA-256: 24f70788a8e98e5883cb296273bcc75041c007e91eaac84c2bb2a4a46b0164cd
font_01_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 11052 bytes
SHA-256: 6382d1f78d583eba2c99215f7974c69079fada506888de1bdcf6f2925c23ec71

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