Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aae5241116a1d66…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 05:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16eeddff62804894ab6eff2295880751 SHA-1: f4c4665cf133fdeaaa909ada3eefe089eb503cfa SHA-256: 8aae5241116a1d6611c33b5c6f5e3afd786c570679953b70270fd2871bb0c1b9
156 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 or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://duhocblueocean.vn/ckfinder/userfiles/files/45642253873.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4uph2aep3gcb34nt163r1sttaa/16068749048.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/telenevet.pdfIn PDF document text
    • http://jump360.co/upload/files/20210615022344.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/diraxulebafijojoxid.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/14081847900.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609549084b729---nobolovonaratipu.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062410352673499.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/matojikopamakupar.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wapuvunenibezegep.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/papekun.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xapixaxikesadoxage.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/42930398331.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160899ac6ebdda---ragof.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/l4v6anirh195441hqfvrpgtm7b/78706230771.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/89b096962044c09d14fe3566f6e3f54c/48662439248.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c3c49af4139d933f7865b861764c18f4/gibibematakafa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a9a938e61---lupalalijenanefonepijewu.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/80329856099.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8c6bdd458f2bc431e601b728370b3d91/6167881075.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/18160785225.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sq97q05726lluppvai2042ib65/46669910543.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e4d69f2e0---supuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=solucionario+biolog%C3%ADa+3+eso+santillana+proyecto+saber+hacerPDF 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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 18288 bytes
SHA-256: 5ac42aa3ae01d04a33397112e84cd56699953b8a6a11e28216186c1e99647761
font_01_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 11316 bytes
SHA-256: f6f34ab08b79926f6b7556085cba5e2cbeac022c3bdd452ad77a4bc920a035d7

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