Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1f75d1a4a66782…

MALICIOUS

PDF

69.5 KB Created: 2021-10-05 16:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 535413a83686e94f9298e302a418f258 SHA-1: db04032bdbc0ad93a25d6a1d360f546599977d30 SHA-256: 1c1f75d1a4a6678203470fe9760f23c6b4fb404c141d8e022b8d6647e21bf751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=calculate+delta+h+for+the+following+reaction PDF link annotation
    • https://handinhand-daycare.com/ckfinder/userfiles/files/livasapepemixuk.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/19016558972.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615872046ca01---jasapasawodup.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/jemazude.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/wikasizinasa.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/nuvivelajemuwa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/513hd9q2mg8gld6k6d42tcf9tg/4367289004.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613422cb392d0---nemudoxasemozuzijarovi.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/pusadofitumegofosexilepav.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/96636230287.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109052256558042.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/vidofadejadovuwunimel.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/84813375597.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/vonajinawozeb.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/23099224792.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/42357984238.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kabidizewokuziworamuzuwu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bilusazowefivul.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/zekimifefuronuxigexoxal.pdfIn PDF document text
    • http://kmjjt.com/uploadfiles/file/032212567883.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/figiratukanote.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/gajuwifelofaf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac8f08a269---bebuwit.pdfIn PDF document text
    • http://full814.com/upload/files/pewuwinowupiweluwi.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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 10804 bytes
SHA-256: 1b6317dec62126bfb9a6040ad070e4c94973f193ede4e8c38c9e5907ddbe7f83
font_02_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 15024 bytes
SHA-256: 6b4e4812a5a79d0c2f0511437b0dca8fc6efae89f32ca169583f57709cc95012

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