Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce0965f6b399c3f…

MALICIOUS

PDF

87.7 KB Created: 2021-07-25 13:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c8edb2bcb85d0ccb49c6c879c8359ac SHA-1: 00f01c5db58ace1c350316227b72ebcdc6901fae SHA-256: cce0965f6b399c3f8c2ffeab899dd8e81c659654d413bb551bd9604501a3cb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms the use of compromised upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kr2iv1cikkn7cgbdp72o63k8nl/57415913131.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/447448a0cb9a854ede59212724ab033b/xinofi.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd0c6620e8---sazofaderogigusadikutele.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/90b5985970584495433071f3f8d2ff1e/finikezubuvawoxajoxo.pdf
    • http://dush-kz.ru/uploads/fck/file/48502382186.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nccrfajkg76bb1792n2e6ss36r/kiwuka.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6eaaf2f---wusup.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd53043ba---80198862472.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/colch3jfa7usjqo1l2tsggbf05/tabisakudinasuwafato.pdf
    • http://reelproductionshd.com/userfiles/file/50259278515.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f529643ac5e68fd295bcc746cd1d7494/46637217576.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/vinetujibovoxixuwakaful.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608796edda4fe---lebapovanirojekafix.pdf
    • http://stark-tools.ru/images/uploaded/jobefavegidizeseremonoju.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072edc33b4f9---43768644018.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb1636be5---81838735038.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8683toq76oka1sk7hbnmn9kdv3/13187263030.pdf
    • https://artbynela.com/uploads/file/faritola.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ab07bdbddd7f4c273b4dbc4d3fad248b/sokixenubobuzusitoror.pdf
    • https://allcreaturesinc.com/files/files/3779775380.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c716cea70---buworesejasikewe.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2ebcfe3f---bilasajepewutetaxuzenexo.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/39976866647.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9a9d333d047ad9dd143730699fafc2f2/dogekujavutaze.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8422b15b23e1b464633b72f321d6d1bb/8830872995.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=place+value+worksheets+for+2nd+grade+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20b.bin
25f9c39f302df669c5f059d50d323f6a8a53b61cf5a9bf252ea20a51447f9658
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 17060 bytes
font_01_sfnt_off00011e08.bin
41d0930f5eb39d65206ae9f32898c8857c35853cda1aea0d2faad89e321f4ffd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 11128 bytes
font_02_sfnt_off000137f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 16792 bytes