Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace1c593e856ff68…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 23:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c47f1c337ed81a8e8b2389c2af4c7d0 SHA-1: 80fbd88222cddbfff3d7bf1fcf3f2c6faee902c7 SHA-256: ace1c593e856ff6896c7e095dc2c899a6094c7ad2ffbd4b97109a402208865b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and link farms, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The embedded URLs are designed to redirect users to potentially malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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 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://drafthe.ru/uplcv?utm_term=words+with+two+e%27s PDF link annotation
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e743b9fa---ravugusoka.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q2ku0aannaan8cfsso7h7g0l19/57407475728.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160800341df5e1---90730206572.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/84836028547.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8d23db91e71dd6b70b974b8523173bfd/25495451720.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e60978a1bd558481b5b40ab85f9e040d/10774891463.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/4445577919.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/gadezezokamugif.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/16131512028.pdfIn PDF document text
    • https://dintek.eu/uploads/file/rodarimilikavamejopegib.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210701_D80ED8F4C09AE0F1.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/ziwamumudixege.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oba3l9mk2fq14e55d3v66fumi4/92441299867.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/2721986251.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b07c6b6829da625751fc5442d23e7271/zepujojovej.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/66128269609.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/duluxubisax.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3858deb9c5---bikevu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611256adac708---voduxobefatafimutotapa.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/sumexumedewomifo.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/milovove.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/90792677544.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/345ca3c965bef14f0398dc7c87f2cb46/79727750850.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0b87b10d---14961177639.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde9106398---duparopaxiv.pdfIn PDF document text
    • 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_off0000bc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0D 15448 bytes
SHA-256: a21c6013a289d8014fec4159373d61a693f5d1c4930218ad09f456c3ca02ada5
font_01_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 10144 bytes
SHA-256: 16424be711ecc303c1975bbaf49be5d9d4e5bc950d36f09dc06f2445b8bca64b
font_02_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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