Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b689746cf291b18…

MALICIOUS

PDF

86.2 KB Created: 2021-08-29 14:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 440f5a0eeabd80e72d9d0953a8639592 SHA-1: c3dfb8c285ba64edc5d5d268b76c8e2ddce4dd88 SHA-256: 4b689746cf291b18106b58c7cc30e7e996f956ef6f16f9fcfef6bf49228a20d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=bengali+meaning+of+curiosity PDF link annotation
    • https://pergamine.com/ckfinder/userfiles/files/86473116466.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161043a18519fa---zoxagoz.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/ramunugivozabiwufeluzov.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/vuritovame.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/sajigizimulelotoxalebiga.pdfIn PDF document text
    • http://teledirk.com/d/files/xebumef.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021082917113973499.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/55299990733.pdfIn PDF document text
    • http://salt17.com/userfiles/files/jifedatevavimafovi.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621539401.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3bdf7ef218568a13276c14338c201cf/maduxusamiwemeduwoneziki.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094de1524f8d---75338562153.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/walogovat.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/2938446094.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/76531186737.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/simaz.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/nuu0ovnnqnufui48rcq4ninkdf/23017519398.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/23665227856.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/18342846937.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/4355427775.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/54500527742.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/081429046865.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/97042646960.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 10948 bytes
SHA-256: ab32b8114adf4a7a4a870a053baa2cf6cc0865e892a794f77b2053a729ef8d8b
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 22076 bytes
SHA-256: 6f48377b48e386f37a249d4d32784585250d9acb786e4f34a0f8c3ab8f460df7
font_03_sfnt_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 16364 bytes
SHA-256: e6186e999161ce57077d025d0c52f3bcedc48b6cfcd6e974919c4cf2602c20a0

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