Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33a7a75a3e3b729…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 09:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a1f1b43c6a7265849d2a26aad685afb SHA-1: b49ed56c3c5062b64f3a10f59687d079b2c670b4 SHA-256: a33a7a75a3e3b72933c9ec7974fe6be02c94a6f8c6daa100ecd6596daa3a3233
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) indicates the file is designed to execute code, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=reproducir+videos+android PDF link annotation
    • http://chiaranannini.com/userfiles/files/76530870246.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/75806915809.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/14722513513.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/71690180445.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/tisexagimoketinekabolal.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c07702aef0---papomuvadimuranepibabo.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/nelotedu.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/rolowesuxave.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vejetamemikose.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36761078111.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/58594151980.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109210231354189.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/66858341698.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/82522916313.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/54579630485.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1g181k8bvt1qpet711in6lgubc/76824178720.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/saxavojawidesanan.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/vimubu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d51ec76d---kanuxarepixobomom.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/16788369909.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/62185919909.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/7411904191.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/rukefejofezefusiwob.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/33029411209.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/28831311404.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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10572 bytes
SHA-256: 4d415caa9431eaf3a1320ad4e7f62ffac8d8a22e47a02c2a8de2a81dbeb4df7f
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 17356 bytes
SHA-256: f84810d090be4b1587e18ce48f7e55b18fb85187a84f0b11268daa5f5f687cfc
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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