Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe8b3ef207ae40…

MALICIOUS

PDF

84.4 KB Created: 2021-08-26 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33da4ff204a643dcde36797c614e5877 SHA-1: 24be687bd2894d9ee19f1b98e05a69a0b11802e6 SHA-256: 0cfe8b3ef207ae405a9d4a6b453f2d7eb83cfed0bcfc9246ebd41582a6106572
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV specifically identifying it as a phishing trojan. The primary attack pattern involves luring users to external sites through a link farm, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://holocaustresearch.pl/nowy/photo/file/boraloludu.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3tq6li8uo7h7g2d1krbv44pvv2/99127726461.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/19332468174.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/7246341501.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vokezunumojapivojeduk.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f086f853d519b491da7d9e2e7d9abedd/97791112746.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54f71de7c---kozixufupizoxodobusigug.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/9581102377.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d7ec35b3---fuvijojugemexopabokuw.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/ravirazogopiju.pdfIn PDF document text
    • http://centronegozi.com/public/petosolimipatusidepuw.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/epjlvooru6g1rcqib16a0kan57/29674636301.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tqvep6nhitjpsdjlgd39fj9sj1/zuforosakunobonum.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/59096848901.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/31046446502.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430182517103.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kusidakejafopike.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942234f3feb---83537382609.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cbef08a20---zojilesasuvamirugoradomiw.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c9c4a0bb2f78bea3dacbdb0334d229b2/5731805383.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0006f384dd---26755786612.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/31604819361.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/96729145088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=they+are+frustratedPDF 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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 18976 bytes
SHA-256: 4c2d9c68ffa82f81148986a1a190717840243a40d4d656a8b26f0fd2f14a3487
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 10264 bytes
SHA-256: 6537d7f4cdb371a755be6f2f7272af397e84e250afd2f7bb6b4adc27f37a7ef1
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1