Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea347ba2679411f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-22 15:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b575100ea202b4957797539c4801a6e SHA-1: 40edb36875c0afb93e8b49c8eb1bb1dd8789008d SHA-256: 1ea347ba2679411fb1e262863c8299d9a89dde8d9213079476d6e160a970ce29
176 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external PDF files, many hosted on suspicious or potentially compromised domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a distribution or phishing campaign. The presence of an IP address literal in a URI further raises suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://mimpishiodua.com/contents/files/96560414712.pdf In PDF document text
    • http://dispensapertutti.com/userfiles/files/13182522640.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/64398739745.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/doraruburariwukisopefitok.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/vukegoba.pdfPDF link annotation
    • https://aayams.com/userfiles/file/noruxojutijamofi.pdfIn PDF document text
    • http://splogservice.ru/content/files/fexapegovujubawogabunu.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/kinetugalifuvokekuxagep.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/77776514624.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fbc33c2e---jopebufagom.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134b04673623---fatadanoxol.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/pipijefatijoterunu.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/10819018178.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/wivugakafowi.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/72470461253.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/6226784591.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/19124984537.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/22459233480.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/xudugum.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901050252.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/04086e59336c05abff578922331af6e8/sulenukile.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144e243486c3---polexuvivapavaboraborafab.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/rimirulepozum.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/namopesegaw.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/80588367715.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b849f402e3---30500550590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dragon+ball+z+he%27s+always+latePDF 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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10732 bytes
SHA-256: e07a743d7843fff9175ff46be000df90365e8283ec83cd433180f86f4cc4042d
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 21740 bytes
SHA-256: 067d2aa59253b18b8a525589ba1db470d40743fcbcc18e445e5c233444df1f21
font_02_sfnt_off00013bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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