Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c4ea62fe4ad223…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 09:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad1233b9b04ceb59405d54fd7c92110f SHA-1: 883831ceff3a7ec918d92f5bef5bfa2c48d2af04 SHA-256: 40c4ea62fe4ad22331bbf550401e9c46c875bf78ea0383250bf3af03792d8e49
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to external sites, including those hosted on compromised WordPress installations. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis strongly suggest a phishing or malicious redirection attempt.

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://laatjehuisweerstralen.nl/upload/file/5699139045.pdf In PDF document text
    • http://acevina.com/webroot/img/files/tisilepomefamiwuje.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/65983526158.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/misetukabi.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/gebabizewuwabojo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d62dffdd---defubiwize.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/zijinabegureror.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e3c0c314---purexinanibelitid.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/titemolage.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e43c9bb43---zorejetevutuf.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b3037cbb---97852856747.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848f85d31cf---98568366330.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/raxotuwusosibapixat.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/54832072281.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/rekidowilusolixanumedado.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/87551095091.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/coiuuj6k2uh9mne8bufe7n04p6/55644369747.pdfIn PDF document text
    • https://fallsplat.se/file/56575985008.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9b5d2101---74704957239.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/setibisimojexigokagub.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/kuvivowosugiduzodoroda.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/tulizidevururifevotozux.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/kiraxibemixifujidit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ser+humano+como+ente+biopsicosocial+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_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 11200 bytes
SHA-256: 1566b6357d35993bd4d6cd914a930f571a1c4bf32f5dd7633a380981811f9faf
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 18732 bytes
SHA-256: 6f66fc4eb78dd342ef8b4f0fb99ae6582363d20c572bb6d37f3cd334b1799d0e

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