Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb672f56c1a807e…

MALICIOUS

PDF

106.4 KB Created: 2021-08-01 05:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daa08866fe37bf031936b4d7d945ff51 SHA-1: 7bd2fd9dc29d742e9448e944676ccc7aaed1acbf SHA-256: bfb672f56c1a807e6955d9100ac075b15d5f24fac1e834bcd05084d93dec762c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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://originalcheck.it/public/img_admin/file///zerevex.pdf
    • http://s2ipower.com/survey/userfiles/files/sepepaduzuredaliga.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94589f5da.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/rowibesazolawapogewavibe.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae04c132225---xesamisirivolov.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c952ba9d85---basasadojuverajugidig.pdf
    • https://dermatologie-francophone.com/userfiles/file/36542998150.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/546958459.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/02f4f0f558d60ff4afbc9b328ab8bb7a/josefawuxaleva.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/4778436228.pdf
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/famowiduwonoxa.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b2a0a801---542570746.pdf
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210722230123.pdf
    • http://guides2alpes.fr/uploads/file/58618180858.pdf
    • http://hzdsbg.com/uploadfile/1624985026.pdf
    • http://brcassociati.com/userfiles/files/90108805644.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf04420bcc---sonudimodu.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/dimodinaninunabirabamo.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af7cfe0bc2f---wojugu.pdf
    • http://webbuilders.com/files/file/61521688039.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a08a7bf4---40103843271.pdf
    • https://bawwabatrizq.com/userfiles/file/zekeduresixaxalataribol.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836096cad1a---fesutim.pdf
    • http://studioguidobarbieri.it/userfiles/files/11870433403.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dd2559360e248d480654252ffbca34a6/81752187929.pdf
    • https://rabudiagnostic.com/userfiles/files/bunujolu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=competencia+interespecifica+ejemplos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011613.bin
a0616a79b568e7f5af61dee4a75ed48a694735e0b3649cb9602cf0724fb6a59e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 19080 bytes
font_01_sfnt_off00013544.bin
98044b766b1b276801c373f059e5bb5bcd02fee2b8441dd29f34f561f1910046
pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 19460 bytes
font_02_sfnt_off000167b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x167B8 16792 bytes
font_03_sfnt_off00017fcf.bin
b3b62b0fa5c3aac279281402cc7818c6c41320f7d16f2fc59ad0e051fce04dc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCF 10800 bytes