Malicious PDF — malware analysis report

Static analysis result for SHA-256 32450a8a5c737f90…

MALICIOUS

PDF

84.4 KB Created: 2021-07-06 14:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 115e6082c4f4267a1f2186599d11464c SHA-1: d400952c89c56a01d5ce7828de3b81114903178b SHA-256: 32450a8a5c737f90ce01ed9b6e3d82b315becd586574080648b9bc0aa0ff6fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on various websites, some of which appear to be compromised CMS uploads. The presence of multiple external URIs and link farm characteristics suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f62e7f7892697659e1595d743fdf4b92/23235516327.pdf In PDF document text
    • http://huucodatlanh.com/userfiles/file/lerodijuxubezike.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/66116399541.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210614084134.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc37f4f62a---66800404328.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e9602471---18067561086.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/18d46b31f893cec15fec3d4e82985d93/33402706930.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/vupifidonigigusufe.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/15206216774.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e4766732---60504185408.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/21545306885.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a389ddc8a14---rugaferukipugodikibe.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1g3srmee2sqjkllh55kokqu6oj/74308903702.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/68768874594.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/35084357654.pdfIn PDF document text
    • http://industrialdevices.in/uploads/42110205010.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/25136724471.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2feb826026c73f36c2db83c48af3a50d/50326572676.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/zuderofexezu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/40073982298.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/4045333418.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bd377decae6796e7e2b98bb441bdf052/jajoroze.pdfIn PDF document text
    • https://educhina.mn/editor/files/labuxirorakamavegunujoti.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078091c6fcc3---pijezolekega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kinemaster+mod+free+download+for+pcPDF 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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10860 bytes
SHA-256: 6e2086459f4d5de0b776fb949658b23f3f62cf3962e01e5dddcc966f8f38d5f1
font_01_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 17340 bytes
SHA-256: 5054f3e53b471ecc6947fdb8da0d24050f3c81df0ab994b0437f489021455ce5
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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