Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b32ec200f9325b9…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 11:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d5b79958226462e74a9e6dd85774fd3 SHA-1: dcc0890c3e77665277be6feee0cccf30a03a970a SHA-256: 3b32ec200f9325b94e69aac9827fc903e9904ae5b417d06c561e7952ed48b354
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS upload storage and disposable hosting. The embedded URLs likely serve as lures to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/85420480646.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138deb51ee90---fizevilunudodusude.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/vovitamilaw.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/butilarelurixuwuvu.pdfIn PDF document text
    • http://laatuwhuisweerstralen.nl/upload/file/pusureb.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/10941059399.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/87789167810.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/71731970713.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613497e6bbb93---46669363952.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907040220733064.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3721c0ee---jubogavemipegiraxina.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/pinajiluxejezup.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/24691026134.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hdddqdeev9qem4uangqhq0a4gr/50652854151.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/mifezosimaxonamu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd0819219---76996016159.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/79980550680.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/39192947068.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613a747f22d79.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jirulajafedupubu.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/40508204458.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/55254099082.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/65347165211.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/83563995689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cinema+paradiso+streaming+freePDF 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_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 17476 bytes
SHA-256: 86e54ba25323e61f8109253fe951fef4ad86a7cab11fe24e20d191567c405dda
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 10828 bytes
SHA-256: 3d5eca1ee208483fbf8089ea4bbee0b502920b37224e6fc04a586cf9cff20a80

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