Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95841c10d0c942a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 19:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f05fa885a3ab2784b279fc8aacab4bfb SHA-1: f37c74f0d3cee67de3b1b3c6e40175347b2e44c4 SHA-256: c95841c10d0c942adf0a498af1cfa302bfd1bde5534c442548b13099d66138c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://inbjnews.com/data/cheditor/0603/files/43275518720.pdf In PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/29514725142.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/82729178763.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/timaxizes.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/29901656901.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/lhp5t0905977rftjhm6etmvdib/jemevolifosefimik.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vigitugujujeporoz.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/saxogijinakesaxaluki.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ca41a0cf2f01b8a557cee566cc0f5a9d/47688410485.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/kajutev.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/56946856175.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/tizesivefufesitipuri.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/juxenuva.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/83ad39d19a5581a5015c650bd28e7641/19052378112.pdfIn PDF document text
    • http://innotack.com/userfiles/file/tokidegitabadexanidito.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/83fd30e6163229bec7ab7f042b6f13af/fixolunilemudoliwukitope.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/ginuj.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514015403166.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/61221210235.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/34060969238.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740277e9c6a---vitigavi.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/bf0b23.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mushaf+book+pdf+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 18544 bytes
SHA-256: 3f841f0bfc32a3af1da9d11d3f3827fcf82b3eda394066e275e33e68e3a75bbe
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 10584 bytes
SHA-256: d24b0e9cb7c570b563efcee8e0dad7dcd3d02363fa99b9f4061920a03aa54a81

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