Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28e792ab14a8312…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 04:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f4aa7c2ef86176ea4150ecdf2fc79d8 SHA-1: 6f51964046847f0e57184ac93b75090bbf2e6670 SHA-256: b28e792ab14a83123246f7a02cbc3f796fb23544eedc694be1c9a510187743ed
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 0.9996

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4aedac6c---80893203099.pdf In PDF document text
    • https://desense.eu/uploads/wysiwyg/files/85894662352.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ec7ccf60---42167790526.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/8083302613.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s81tgsvsjbq7bu094h230a7sru/24907090637.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/75138201177.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/97996851322.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3673e0d31c6ee492a42efc788b80e6dd/wufarareduxirez.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073379e259a5---71806909348.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/vibezotoxafosoveteb.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d4a127e9c5c505aba4cda4108a053905/33440178992.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/835dca2e474898b422a3d50d25cf0586/lojukusewafitaxuletik.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/bopefuril.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/900cd0ec69560e5a58ec723cedcff5bd/rawasovirunebisigas.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/90472860234.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/61889600022.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/besutum.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/91172254074.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/kakegotewov.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/vogiritobivesozedonugemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=empire+state+building+materialsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d0b9ba483a89bb87105a64d7da728cf4/zuvabisudu.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_off0000caa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 16428 bytes
SHA-256: 518dcdf0a9112fa9f5750388125b66468d9c916772207d462de99731fb0a6cd7
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10836 bytes
SHA-256: a71096a0553f614052d99629d0e8f220444360c8709376b9bf82352d90cc3a96
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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