Malicious PDF — malware analysis report

Static analysis result for SHA-256 214ff157ef75ec77…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 06:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95c0afd91e8786e4aa6df98292eeeac3 SHA-1: 67a8b2359d5b3dcc9fe3972ce8a12af64fbd4cc2 SHA-256: 214ff157ef75ec779a4763722066f6732b7a1b5bb18f04af63bf6f0dd7e51fdd
156 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 potentially compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yongchengtech.com/uploads/files/202109050643214357.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f786f64fd0---dipajuse.pdf
    • http://4darchitecture.org/img/all/30893527231.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/64815181591.pdf
    • http://seyrimerdin.com/userfiles/file/zejanag.pdf
    • http://itps-group.com/uploadfiles/file/xazokixititulaginitiba.pdf
    • http://stihoplet.by/upload/editor/files/40500187501.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdca9934f6---lubowok.pdf
    • http://asea-admin.com/_userfiles/file/20210909193617.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/57345219301.pdf
    • http://crmloccitanecr.com/campannas/file/samiw.pdf
    • http://kaies.cn/upfiles/file/xinojezakobosuv.pdf
    • https://pixel.bg/img/file/datalubobexukokezun.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dikifizoxemux.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/didibepir.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/11159584102.pdf
    • http://pc-driver.ru/userfiles/files/57754807887.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/bemovopezigapubi.pdf
    • https://schmitz.cz/res/file/romig.pdf
    • http://problemconsulting.com/img/download/files/buvosujonini.pdf
    • http://kes.org/upload/editor/files/18721403131.pdf
    • http://knipia.com/userfiles/file/79694593048.pdf
    • http://archpiudue.com/userfiles/files/96258612512.pdf
    • https://vnycc.com/userfiles/file/40796682434.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d6dcc265---49814676751.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=naija+ludo+pro
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b629.bin
a90319008e35de769656bd711f5de7152732417f7494284e22989b2c93d73476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 16608 bytes
font_01_sfnt_off0000e13c.bin
956d6297db34df35f0aba97aa54f57c8258437c43f23afd94d6832c3b63296a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 10092 bytes
font_02_sfnt_off0000f7ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 16792 bytes

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