Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a806a2e88e9652b…

MALICIOUS

PDF

145.4 KB Created: 2021-07-19 06:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2466196e7d6ead4a69d5abb06211f84f SHA-1: 8500420e76eba31011f21d6ddbd9259d3d1ed5da SHA-256: 6a806a2e88e9652b3d0fbca095d92c35541dd3f6727ecdef13d579139a456523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious or phishing content. Although no scripts were explicitly extracted, the nature of the links and the detection suggest it may leverage embedded JavaScript or other exploits to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160727360060f3---josiso.pdf In PDF document text
    • https://juhaszautovill.hu/userfiles/file/forimiwavokafojetevamok.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a875594bb4704cde352f3915e2547ec4/lalemezovizamuxodataza.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df57c1f0d---97643253819.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/25394377280.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/3p7l31tuolp4q08ns81aes07bk/77976933290.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/38643430684.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/35879856561.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/luwemetojitelejevubati.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/dakebalatodudodamive.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/wezenobajixak.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c7ad0150---sizozelavalisifivologikut.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/52935928963.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6ffc66d9cac65295d4823d5918eb5700/pozuwokanevefilijerubanu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rumevajenigobadenumitaso.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7husb6ec62n3vls51rm5ghfo3/76122271140.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/tizij.pdfIn PDF document text
    • http://vtaky.sk/media/file/rogufulib.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1a6e3300---davidefokelafa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd0686410---moronuxonem.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/da8d151b9a412ae9287e989a157b5e86/84346769032.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/19547949603.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/addc69676d57a590bd3f318bc45f366d/6410178283.pdfIn PDF document text
    • https://ancoraeducacion.com/images/88339803691.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/08a03cf02ad64083e038bed14c753b03/jotufela.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tamolusukevuvuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=examples+of+isopteraPDF 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_off0001daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2DC 17264 bytes
SHA-256: 6e023e0cb46564ec388483b688bb4543ce99f93732d3a12920bb7f0363ffd077
font_02_sfnt_off00021fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FEE 10500 bytes
SHA-256: 4fe7a339f689049253ea8ee8cd577ab166db651f6a0ac5a37f544fbeee46acf8

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