Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b65cf8969ba5ac6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 09:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e6eb1b5c7eb969c13d6755e6edd3682 SHA-1: 32ef14cec648cd98eb7124a91b9e4eda7f5b476c SHA-256: 6b65cf8969ba5ac61f7eb6d7347df33a6520de0d741c449a594f3f7eb3c9a46c
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of download-related text further supports this, and the file's structure is consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/87a57a86656bcb86f1c6960b3e85b4b7/fimofez.pdf In PDF document text
    • http://franceplus.fr/userfiles/file/60158454375.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bec2be46d---tuvatudusiwam.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/xavijosag.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zegobapizusa.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/waginoro.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/98961641939.pdfIn PDF document text
    • https://12shio4.com/contents/files/23055280565.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/65960050362.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210902201807.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912e2c0225---zogikililupuwuditi.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/84377074238.pdfIn PDF document text
    • http://planbmedia.hu/files/pupez.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/gibememarenozijizufikemi.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/budirasipovasojaxoloze.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/78116574682.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xadivanekobeza.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/53342959216.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/10903334114.pdfIn PDF document text
    • http://offerparts.com/upload/files/57543560439.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/fafiwetonon.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/20061465813.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/73323812059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+apk+mortal+kombat+xPDF 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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 17124 bytes
SHA-256: e5e14bfd84df0f9eb97c135c06d264996eafa737c7362269de1fb9f7e21acb14
font_02_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 10584 bytes
SHA-256: 0e1142def91fa8f068a5feb3cd145de98f9ce9f71e4fe305427615966f5abb9d

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