Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d259f159b1a7fe…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 13:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: feb3c4c6242967ee29af4ea403596669 SHA-1: 0f82858ec2b4f303faf49a30a9e4d92a397d121a SHA-256: c3d259f159b1a7fe2d244123567fcd42e76144868c4a9dd204d86a1b7fc261d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious sites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=best+android+emulator+for+pubg PDF link annotation
    • https://a2designbg.com/userfiles/file/46762205056.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/kigitoneganupiwepoziduz.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/65663812685.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/3385021187.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa72e5b33c---86136582207.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tusepeviterarerenubenokip.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1025f5b3---sixekusukesexaze.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1hp062jggm3ke189stbblccdn5/kinaworakumidepujil.pdfIn PDF document text
    • http://nfc.soo.jp/file/lokesowivegewez.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/29341178479.pdfIn PDF document text
    • https://jotelek.hu/files/file/purebozinef.pdfIn PDF document text
    • http://clerus.hu/files/file/37404680591.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/92451769825.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/xikanorisigizajem.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/34530445845.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/15846514834.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06f0b3f9c---wifofewoxugipo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/87577429558.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210915224747.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/nezelejidajaguwow.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090505064873499.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c07eb5b44407f4f084a9ca947c92e35a/37160878487.pdfIn PDF document text
    • https://ms01bet.com/contents/files/31238368902.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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 11132 bytes
SHA-256: 2bbbc0b6ed80ee13643b8beabd46cf411180f81167edebbe1dcd90b9471c1848
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 17536 bytes
SHA-256: 979980bbc84103d152e92d175ebcc5f43e3b5b58a94c785b75c4f3d51d8b55f3
font_02_sfnt_off00013a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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