Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6a12d180e10b23…

MALICIOUS

PDF

82.3 KB Created: 2021-08-29 21:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4980009dc7e8ec3c392a4fd689e42176 SHA-1: 3e8a002ec903094ea0f996ed0bbc1e5c0c497a67 SHA-256: 9a6a12d180e10b2393f00f47274880af43b30fe672e3da143bcefafa4cd8cd1a
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 0.9987

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://prana.video/wp-content/plugins/super-forms/uploads/php/files/mg5uscqvm2br1sqomepvhkek8s/22802234176.pdf In PDF document text
    • http://studiosiriosrl.it/userfiles/files/pofafokibilavobigopegavow.pdfIn PDF document text
    • http://schokozentrale.de/idata/wukixamumapet.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718c8ef06f4---56157611716.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51ce688b844a988770cb6835fa8bbd38/16541332841.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b1678e76fb7b9eb7f0014dca3847bb06/vaxapijopovumajober.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff614947881---67741363085.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/21852487861.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jenekuvokejexipoti.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zowilirakuxe.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/77e1cd47d8925c544e319707862b8ca5/63791493461.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ogda21eni82g3k0c35midhg2kj/48047434905.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b91150a99a---nuxelojijivataroxuxateg.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/37799734989.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160781a4625ffb---86458297962.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73cfd6a50a---supepali.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/68614117381.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed566a04b---zabugomomoraboxu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/57456033442.pdfIn PDF document text
    • http://jkohut.pl/file/11413623788.pdfIn PDF document text
    • http://metapolar.hu/tmp/71892305294.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2ba089de---vaniregonodor.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bba34bc62170efe6c8f3bd37b421fed7/47619752899.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/pofenomovaxabekuvabolurum.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/61002407532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=complex+to+simple+sentence+examplePDF 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 10568 bytes
SHA-256: 56c4dc0235488794a0f02947cec28c93cf34bed0599f9c30f8d5e740570468a1
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 17356 bytes
SHA-256: f6c1a0da6ffd93cf642b5b8f35ab4ebd3f1c39d1e2090d229e6272d7093868d0
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1