Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c0b77a8b712e04…

MALICIOUS

PDF

75.1 KB Created: 2021-09-15 05:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfe94649a8386c65302f4e28e91d1886 SHA-1: 0b472d385e8aa40efd8fdd6e296f6b448462334b SHA-256: 62c0b77a8b712e04c1754d2a28f5e0b2821c1b459162fa955ba13eefab90a77a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports the lure tactic. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=download+img+tool+apk PDF link annotation
    • https://ukmalayalamnews.com/userfiles/file/43483119485.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/makuxo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/78334162823.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/19504715152.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/jelidobireweze.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614076abed355---kimusa.pdfIn PDF document text
    • https://tierlistei.ch/downloads/bexigirini.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/nodebemupegi.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/75881190323.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/928d47ef1a1281458cfe634c4bfe7862/23830276479.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/sazawixi.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/30810926543.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/65853383797.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/86328292921.pdfIn PDF document text
    • http://kes.org/upload/editor/files/18721403131.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/78829177630.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343239cb5e2---rutokokedazi.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/72007306899.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/rasibinozotugave.pdfIn PDF document text
    • https://lecachet.fr/docs/files/siwebodejirakilemile.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161411d645e924---ligemimefo.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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 17348 bytes
SHA-256: 30f405dc4e2abcaefb55ac20b24d65f4d2287b4f2be0a69dca3609ac88bfa1d0
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10512 bytes
SHA-256: 318a3999f1b2921b5c7be00ae1d16cda51a51fee3e548b66f03c89c2ccf30c3d

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