Malicious PDF — malware analysis report

Static analysis result for SHA-256 887d37cc33411713…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 04:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb0bfe92e8d559872b7bf27dff734528 SHA-1: 2812cbe14f1f60f4ab312822660ce996873cb770 SHA-256: 887d37cc33411713cf7f0477cf0f553b217e97a310df1f2d516d97a7343df515
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=casual+language+examples PDF link annotation
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/66eb99bbd83tpcmgu2lglsm12f/24361098764.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/bositunemoxovekev.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/wewasukidoxixatam.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090c86157f46---90188905573.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5a0107b6---86175258056.pdfIn PDF document text
    • http://zuche0551.com/upload/file/57109687958.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0129254bde---71137232114.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/55c95523c44cd9c35db042176384abc7/juwudeve.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/14666314104.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/90400593680.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/47108037520.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106222156162063.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/27826784126.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2ba055355547e292e2e9d59b9af344ac/62052683858.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5a93f7797258746b8208f201b77d2219/tovuvabuwefaditake.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/22829725262.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4e9bc704---suzibavodez.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8gdcp52fcl9aebevofpldt40h3/melurewif.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6081f62198---87117528037.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f32353ed9---22257383989.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93570819c---nigokurav.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/36595925908.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_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10416 bytes
SHA-256: f99f7abc25bd2c4c8ce1f102f16b27efc6952816f6ebcb9998d3ef82a5a9bc0a
font_01_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 17232 bytes
SHA-256: 2f8ceaaf741cfcfdd4c635e18d35b1a18d5a0f9a7c756a2ad82d4f516f4989db
font_02_sfnt_off000142da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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