Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c453b84f4503b3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 12:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cecb7889ea8f6d829b0364394dbc8686 SHA-1: 28489da4f2635ce4fd47d3bd84a0634ef65f5c3e SHA-256: 85c453b84f4503b39bf28b10722f94047c59b827cb3c7b29441885ac06e503a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=donna+lee+charlie+parker+pdf PDF link annotation
    • https://resicolor.com/upload/files/kaforudawigesetolajo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399992bb554---14985844539.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/vokaxozugikomum.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/vilukitawipogofonov.pdfIn PDF document text
    • http://scsytech.com/upload/files/85082008343.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/97649952440.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/13122332346.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/4156076771.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_19D703D1A6DF05F4.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/70412196771.pdfIn PDF document text
    • http://newcityhk.com/userfiles/zodewavokugerewel.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/28624027308.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/vugewed.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bcd0cfe9---51329069516.pdfIn PDF document text
    • https://gulamanis.com/contents/files/22988091696.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/mepujezuzewi.pdfIn PDF document text
    • https://ubranni.com/uploader/files/9763252080.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/11547604469.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dee5291eac3e883a69b4dc263fddede6/73369106375.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210915160752_a3kmae.pdfIn PDF document text
    • http://enricobarraco.com/files/wutoxizavavimaliwadomuvor.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/sawuzude.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/86637362284.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/puzagirineguxufamonubev.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/60829022533.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/nobevufuzasamaxofiwopuro.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_off0000ba05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 16652 bytes
SHA-256: ffb360e27b70f5eb82bc771863eff4b356750582f937f614398345e2a6958b8b
font_02_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 10544 bytes
SHA-256: 83b5e9fb4f0266ee60e2a9e745fe20083df6586be0da2e7f43a7d1098feb80ef

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