Malicious PDF — malware analysis report

Static analysis result for SHA-256 a886769b84b6eadb…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 13:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 124aacc80e8a0fa735cf4b293832cf11 SHA-1: d03048376c5f26689106c72bb9b78eb991464610 SHA-256: a886769b84b6eadbb096dd6c2e0bb7e12a9ec3bfd6752e3311dc40414f298394
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to various disposable hosting sites, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jrpst.pl/userfiles/file/56619403842.pdf In PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/sotak.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160855cb8c89e5---62254339065.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459f29b56b---62031362601.pdfIn PDF document text
    • http://yibetter.com/data/files/mukesokunidipakenij.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/12/2454140790.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qv7o00gfanermkipv3plsgfvtq/9272500394.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/golabur.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/sepawunamosevapafud.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/12445307653.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d978f6e9085c38ce33e2fe22a76ee165/67626037405.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/33807061791.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/93738945711.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/ropafizezupilediwadajinag.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e85d5e05d3e---piwev.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/dixigekeguwususa.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/54367902601.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/20369599e197616010127def3d9e7ffa/49194932795.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be7c75ae6---28424817549.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/32400314644.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/solojutosoxexig.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/75203572657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=compress+pdf+to+chosen+size+300kbPDF 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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11292 bytes
SHA-256: 7136063c0902b2b0da45f681b4f98d87b1e0586e5ecb6df1a85a9f8c0f51d221
font_02_sfnt_off00011d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 18968 bytes
SHA-256: 616ff05cd75ece4ce6434d86445cb8b8a5ae6a39256a7ffee8b732e98ac1d8eb

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