Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb922431adc5cda0…

MALICIOUS

PDF

96.5 KB Created: 2021-08-20 08:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 593ce5faec6e75fab89b758417619f4a SHA-1: be51c52e4fa4a45b4fa997a8b083ca9a0905c5f6 SHA-256: bb922431adc5cda0f48c05cc6bdde6b7e8491eae9ba4b4f42e6930d2558de4a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094a455c43e8---38636941678.pdf In PDF document text
    • http://tincorner.vn/uploads/files/vituze.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/xisepa.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092123885bdf---53032645518.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b253acd45c---40451357210.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfa590dad---40749389629.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/2anqjp6n6ata4t4mdef0io4dsv/11750471574.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/37838682622.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/88639435905.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/sotedojujapubiliwefig.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/28019654793.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9e9ec2cb---14957802870.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6841eaf740f7324e3e775a8577829205/rijazojikofixelekijo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a78990d5b23---zobiruxa.pdfIn PDF document text
    • http://abnicum.com/files/file/34171816735.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/dilolunetefanos.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/12894542294.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf9d8ef5e8---litekenalerepisijigib.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/winopesesidibinototezepod.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73010e651---pasuvejuved.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/sotaluded.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/95388935254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tabla+de+frecuencia+para+datos+agrupados+ejercicios+pdfPDF 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_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 19232 bytes
SHA-256: 15949db731dabbbad52811facdeff077614bb3abe683644be8b2e29cfa2df1be
font_01_sfnt_off00014217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14217 11128 bytes
SHA-256: fc5cd6145d34390a309c70c62d6efb587df8c37cddc3a712edee3c477b5642fb
font_02_sfnt_off00015bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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