Malicious PDF — malware analysis report

Static analysis result for SHA-256 11564baf1246d4bd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 02:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d55e2c78523b55b64f966ba290af0f85 SHA-1: f900a697b1822c62efb5fc12fd4df9266b0e6de7 SHA-256: 11564baf1246d4bd8a4fa38b3ab4e110ea53e281fb7fc88db6b764f1f7f03f63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://polandpools.com/contents//files/27795526045.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094352d34348---wivapubaranafelu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c677059840---joxexoloketibusi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c315cb8b---tosunadoboboxitoganugas.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/uvejuk5drnu1kgqf9buh492qs1/99225010676.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/lovipekodowalanasev.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/73807398154.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/81457258164.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6ef65c4a---xixadagimira.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/68531022794.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zofuz.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/wuparesavokuburi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085836edf13b---wofaj.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/73ed62fa0204f0eac36cbefa440494a4/34812354208.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/34504915036.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cccd9d79f58---sinemumirarulolufonal.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080335c8c8a0---lovanileduvidomesajo.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/21551466609.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3732064917.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27ce6407f---18556003824.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/57307989419.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/31955787470.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/zinevosini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cutepdf+professional+reviewPDF 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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 18428 bytes
SHA-256: 3b35f6e1a80e85389e64cd7ba571b7f117aae12a3ecaaedbe0c9e2edfe3af496
font_01_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 10776 bytes
SHA-256: bf64315fd7595095b8274db9564e09c70d2a47c81b1acf51f6636f9b6e3c5ffb
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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