Malicious PDF — malware analysis report

Static analysis result for SHA-256 92622d7eb9129fa9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 19:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 431d1aa594043ea650f1ff7bf27ca394 SHA-1: fb74e88338d90a1f3cff6611c81d3cd98046390c SHA-256: 92622d7eb9129fa97d6f94a691116fbeae7e3b53b7fa44699670dd508268b0ce
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://thumpamonpally.com/userfiles/file/11892938457.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae63d57e98---lewupuzodonojevi.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/vuden.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/batoniju.pdfIn PDF document text
    • http://df-2.de/images/daten/file/93042290397.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/21293394574.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/nanubupedajojowonawep.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910030248.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/60232771141.pdfIn PDF document text
    • https://profm.hu/files/file/tegagowigu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/jniiutpsrid8ds37rr976ja71f/jikumiz.pdfIn PDF document text
    • http://nenorm.com/files/files/51396275174.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/5526781214.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/78915631725.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/vixijetaregorofojokiwogix.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/88417378299.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/62067302004.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/17154173870.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/83136822831.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/40e7smrnum73f63ncra1d3rk09/purujugarebil.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/zefiv.pdfIn PDF document text
    • https://bem-sa.com/img/file/30032204121.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/39965002486.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/lalod.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/1916685311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+turn+off+app+notifications+programmaticallyPDF 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 18612 bytes
SHA-256: f1ab0665f6f5e6d622f130a8b6c42a652a98c945032eb86947ebf059e911c911
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 11024 bytes
SHA-256: a76a8b9912219c3cc988b777cac49ae45427a3083addb4ead4e5413f613ace5f
font_02_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1