Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e769ce28dad13c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 19:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb8f02573d56c96a2f43e53bd7f1d738 SHA-1: 78c3dca9ac2b812a8ba055a872b4016d7b2af304 SHA-256: 08e769ce28dad13c049bcdc84816e2350af8f8a1304575d9257c2d457b492e69
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO poisoning or phishing. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into clicking these links, likely to download further malware or lead to a phishing site. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=liquid+chlorine+msds+pdf PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/536d330db06058ea63a0218382eb57cc/37370274765.pdfIn PDF document text
    • http://armanetti.com/images/xurixulape.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/53707722137.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/galakuwumugatom.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/98792674572.pdfIn PDF document text
    • http://metzlerranch.com/userimages/rurotoviwerunaz.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/16399868185.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/70132440164.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323ce38c4bf---vutumurikureven.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/28865030845.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ace286a3cd3dd0b63c2e544e1ddffe1/wuzorenesirurubi.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/novakunopiba.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xebafijiza.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/fibunem.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3541a06e---fasegekateluvesilapenipo.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/zeresakikerar.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/xijoxosewubo.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/maluxu.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/72839938336.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/79837487878.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031145155856.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/35224211438.pdfIn PDF document text
    • http://sgpeo.pl/users/file/22100969802.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210902190704.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/roludapametetiturazofu.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_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 10828 bytes
SHA-256: 4d367613c4e2e27439d65ef617e5b24104bda25c700ad2e88a2e59518123613d
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 17868 bytes
SHA-256: 0a3e74ba1e2aa0e0eebb9dca2d24a3269714c5647f509f681524189b6f39e85d

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