Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b832663fadaf0cf…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 02:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6fdd72c0460551f06fb7f47fad1f2ebd SHA-1: c7d03e601a56c1a35696738d2eaa52b36e6e759c SHA-256: 6b832663fadaf0cf17df327e2f00efa6f1b2f09709fe99fc7a036efbe0d2d1af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://garglob.ru/uplcv?utm_term=large+gingerbread+house+template+pdf PDF link annotation
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ac57e82b942b99d2393d6ca01c33219f/dadonulabibibubamegevoz.pdfIn PDF document text
    • https://mfdesign.hu/files/file/33790024861.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bfbe5077fb4---zaboninelapisu.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/22977641182.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a533dd5f3ef68b509b35c0a98e0b2e08/26505576260.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/45361ecf9304cff2d6598a12c211ce9b/jaxemexamajimeforikuvud.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/66372099416.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/waxagorovikibudolexav.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f675322f01d15e23fb6b665f21fd1a9d/sojofojujazaguxumepilakaz.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976fb1ba3a1---daparer.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d96a90235---52873414535.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6f6aa1cd806e92284f1a0b4fd5fea14a/28096741701.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ce850936---kemetiwigogeraxo.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/83063464328.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210902_CE579630A0B5854D.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a160989a37d---71314208953.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeafe6334e---xujefebidoxojaduxutep.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/20649764982.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/29912344806.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6b627b45c---17711190696.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47e7e2261---kokopilirejilivapekesopo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/78ee88c39cbb5f83f7566c236ef046e5/radazaterotabip.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d92eceb19c6---73484653222.pdfIn PDF document text
    • http://erpos.sk/data/files/2131859267.pdfIn PDF document text
    • http://polkovnik.su/upload/file/69631888922.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/nibil.pdfIn PDF document text
    • 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 17336 bytes
SHA-256: 629318445c4af0c0fb7573ce845fe37eb6ba064f4cba987907b1c2241fa16690
font_01_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 11144 bytes
SHA-256: 6062d4dd2f58305a3c81e96e42d0a00acf2c1a743154d5cc361d54274287cbe6

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