Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10acb3ceffb0702…

MALICIOUS

PDF

96.2 KB Created: 2021-09-05 22:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 492bfc3e60aa7d568845b05329572348 SHA-1: 94b2bd5518c171e6eec851cd891eb1496bc61648 SHA-256: c10acb3ceffb0702393cc4fded24eb3e61b3abe853e17adb15b03b8bc3c648f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://laxycoffee.com/upload/files/jinutaz.pdf In PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/lasiretaponewovib.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/93587792964.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/22090430032.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/75851227f9b4bc3a1d2a53237e8d228e/jufovur.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/78215204571.pdfIn PDF document text
    • http://abnicum.com/files/file/48505649618.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/sametimitiwuvalavimanefij.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161271da8868c8---dejujobepuvum.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210825_92E92A61E099C69D.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/43320023960.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/nonumupelikipu.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/43001590967.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/35544509493.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7f12d374---buxas.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81149001617.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105270525489434.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/finirapiw.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/48651555421.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609251a4e4237---nurivusodovumegavol.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/botovu.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/gurekisefurikosa.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/61061567480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=l%27anthropologie+sociale+et+culturelle+pdfPDF 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_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 10992 bytes
SHA-256: b4f38ee42c3fc9c3ba2ce911b2a53db6af86bcb31b2efcf51de0743ac4dd577d
font_01_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 20972 bytes
SHA-256: 8dbbb1e6691cc0b325643e90066f060af139ec29721bce27f031eedb73d6566f

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