Malicious PDF — malware analysis report

Static analysis result for SHA-256 944d64f9e184a3eb…

MALICIOUS

PDF

89.7 KB Created: 2021-08-13 03:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e1f3a732974e20daeb2329b26b894833 SHA-1: 273b554f48323af7c6669892453b94461bb1c351 SHA-256: 944d64f9e184a3ebbb0c0b08d8577efa2fe949bb394503a5f2b65723296766e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests the PDF is designed to lure users to these links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/000d640c1419bb69e6df8b1bde2ba907/kipavelavobo.pdf In PDF document text
    • http://integrotech.com/zdjecia/file/zozitibiwe.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/99719209266.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/970661a691c2b7702c2b98958f9f17f8/zuloxo.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/81134436691.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/1efv0h4i9ggm8h8ocloqvgmn6u/ruduxizas.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/senefusubusaniromutel.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/36432787109.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/qq2c2kel2nvocdj059vlbkdmnb/80669534053.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/sadedixoxufu.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/8438841813.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ed6dcffd---wigikaxuvefukisa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/au7gtdilh3b4cpdvkaouq6qch1/kubopi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b95261a437b8dc37d916e1c46e05e5ad/57640363182.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/wiloputug.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jiririzivukurotefes.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089c2ec16b3f---8891220075.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160813c38867b9---pepos.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/lopokonizogamanopugipigok.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/d15sur1i04ggeimckjf5uunrn1/polifelevonagafokewanixew.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/xilaxegimufode.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/40834977510.pdfIn PDF document text
    • https://keongracun.org/contents//files/66693088180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=is+server+bitcoin+miner+legitPDF 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_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 18056 bytes
SHA-256: 659db94b52a089476249dc14b338811b1ac7a1f9f0fca55f0f87dc523ec2c50b
font_02_sfnt_off00013e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 10568 bytes
SHA-256: d6ba7ec21594e5f9d6db9d75174d94abdef2c99282f917dbfcbb276893a97327

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