Malicious PDF — malware analysis report

Static analysis result for SHA-256 59abc4f01af8a8aa…

MALICIOUS

PDF

73.3 KB Created: 2021-10-01 17:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd2d1f9f57b4c8afa7fe0b91b1566fbb SHA-1: 67de8421cac38a35540a09ae870f2c6ea7440417 SHA-256: 59abc4f01af8a8aa3b91afe7ae2ca9f5ba0dbecbda537365fe18924f164c4333
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143b678c3f07---29924640054.pdf In PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bdb8de052472f4c33b823e77e10b4017/27473758790.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/29588442277.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/13614008623.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/setejalozojenazos.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/dojeked.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/25928775765.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/48115633297.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/toseboxirujalozokexut.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/75916756974.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vobudodekatibole.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161403f2b65e47---29038325337.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/galodozijabiluzop.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/49884148781.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/12494192202.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/jaloxibupum.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jetokogilokikomawasuv.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/dojobofokit.pdfIn PDF document text
    • http://briztravel.com/upload/files/98270866231.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/59660202235.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/kunobunape.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/10415120063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=life+pre+intermediate+workbook+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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 18972 bytes
SHA-256: 67f676c5a8bf65a7b384e0d4b6686ea9bedf8d4bf26d190de457ee83e6c16b82
font_01_sfnt_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 10720 bytes
SHA-256: 204bfd5d8081ebbd151f48bdde39b839c2f1ddaa1890b568d7720a5370b6c751

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