Malicious PDF — malware analysis report

Static analysis result for SHA-256 158e226d52207758…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fe2e0e010fa748c524bd818df68a1a6d SHA-1: 863b815072da7f4caef5c032e564f88d3fd0a90a SHA-256: 158e226d52207758d051611f4300590e77eacb51f19355b4f7a420fabd151611
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160848b7d02c6b---14491444448.pdf In PDF document text
    • http://www.niziointerior.pl/upload/file/54014189344.pdfIn PDF document text
    • https://salonrewards.ca/images/file/gawumikilosefaxoruko.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/jalid.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/39661567012.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31c405140a1f4cbb1744080a7ad9bdec/67266402167.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/liwitimitinafobus.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a07701d490b85f61f83e09e426483846/xemetujenevuvot.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6761ninmglk6ggudjiafm19jc5/99666664119.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4abd65b41dafb369c39d3ee0885a7ad5/68270865494.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/zovuvafuvuxuke.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0d540f196bf8d636dbc933bfa24f0398/35025397938.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/zuvixizemevofapofolaxub.pdfIn PDF document text
    • https://andana.us/files/files/94358143167.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbf5868e74---zewumatasizobakajagudoko.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/84279978010.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/84464451398.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/65987952900.pdfIn PDF document text
    • https://apizf.org/public/file/62090200311.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d60cac6fb016c107538476aa9c96c621/kopidufavurakasinibo.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/bofufikirexivanaduzawolub.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/vaxavadagevejepixamakute.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4e24df342fca9e4b23657b78ffbc8be0/44133312382.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f262fc2b---77192374599.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/lekusitisedodivomid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=introductory+soil+science+dilip+kumar+das+pdf+free+downloadPDF 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_off0000bde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE5 11124 bytes
SHA-256: 54c93bfef03f202da99fae5b6c7bcf0a2afa97c0f01f681680ee4342b05d6b16
font_01_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16808 bytes
SHA-256: b1258b601cebc241977c208e141df8a38879b956ed2d03d18448936e9fc95496
font_02_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1