Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0b1e8fbeb68b8a…

MALICIOUS

PDF

103.2 KB Created: 2021-07-13 21:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc3730b882acdd23198e5f9c8bd079e1 SHA-1: 758b06f42b2dbaeb5cd560b516254d69985ea647 SHA-256: eb0b1e8fbeb68b8a414e72d6430f42953b5a3ebfa4fbe419873c7dec6734b2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. No scripts were extracted, but the structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d604a81c613---12983224354.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3ff0b217---vudufidubozam.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746e4fcf732---8911262127.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1f9n1dc7tghdjhvbskafuod5u/gojugujobakeduri.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094927e00485---nomofanufibosafatimekita.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210611_3B7E6A52571AF83A.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e27b5dde---teroserarirupofar.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798fe21b101---patuxelaga.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/lonule.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160781dede3a07---50931378623.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b26cc5e1fda---dezudoramuxozotosukireko.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/g5lqvpsdlgbmukr0g04943urp1/lubur.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/88739178519.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dc2e5320b---7377863544.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/zuzebu.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/84181725056.pdfIn PDF document text
    • http://maihome.hu/admin1/file/zafoxuga.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/27006125350.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/44607169587.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/xotirarebamivuter.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608989ac1d15b---21420008791.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/60852615261.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1b9e673d---98076108728.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/xibisuvefosana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=concise+anthology+of+american+literature+7th+edition+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/jaxezuwemojabimiwixotenoj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 11372 bytes
SHA-256: 3bd3ff1b5c9efa76c597a2e41f79fb6001ea7c0a08dc4d883e417bee1bae14a9
font_01_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 18744 bytes
SHA-256: b8e5cab675c97d924e0e69ae43e1da7066a182488119f258320b72cbaf0122f3
font_02_sfnt_off00015c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001744d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1744D 11364 bytes
SHA-256: e7102e7324116d844c7a466ab5b5d99dfcd58afe235af713d3590a275eafe8f0

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