Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afba37bbf269d4a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 23:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2289400c6a5750f25b613c1751b22d7a SHA-1: 75cf2b69861253e3b3bf27a54da21fc208e1fcf3 SHA-256: 4afba37bbf269d4a2638b93b45d32f3c7053e3d5129d93d1a7c0f7a900ac3240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec2aa8ea4---jowajexelo.pdf
    • http://euro520.net/userfiles/file/16320750541376537603.pdf
    • http://theexplorerthai.com/userfiles/files/vibetululofakalur.pdf
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/62051718050.pdf
    • http://www.jindatunnel.com/up_files/file/32807561091.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161361fdb07b8c---xanak.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/ruzupuvidalun.pdf
    • http://thenikharvconsultancy.com/userfiles/file/10139837448.pdf
    • https://rcot.org/userfiles/file/rovigufujedupolivuzevemet.pdf
    • http://staresecurity.com/userfiles/file/78962679825.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_050224.pdf
    • http://www.jokilaaksonratsastajat.fi/file/pawixabiz.pdf
    • https://journalofcritique.com/ckdosyalari/upload/files/lisuzijisekijuwerarovadik.pdf
    • http://steinemann-ag.ru/lagojumaretibamugilide.pdf
    • http://ceresasrl.it/userfiles/files/xaxixokujabunix.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5eeb143a4---16744732448.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd2e41c76---zonulesexokonalumali.pdf
    • http://flyingkirin.com/uploadfiles/file/081848343775.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/dijubikotivu.pdf
    • http://ganteltechnology.com/system/userfiles/file/89780931346.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+rom+hacks+online
    • 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_off0000e98c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 16792 bytes
font_01_sfnt_off000101a3.bin
451ea3db2d8a767db9dd4631ba1c7e956358e1d730699628564d1776d69da82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10488 bytes
font_02_sfnt_off00011935.bin
b78645edff326a2f9b875dfd46e3dbb546462d4ff6b3b5738beab88ac40a1589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 18508 bytes

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