Malicious PDF — malware analysis report

Static analysis result for SHA-256 47901e413705bba0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 09:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88cfc0b37ce59f9c4c8e2cca4d017790 SHA-1: be1958bbd592ac7d5b66fa0483a8a7bbdf9f7bd2 SHA-256: 47901e413705bba04b767d79207266b4eb2c4bc4fc472a419476388361e5491b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.prctech-th.com/ckfinder/userfiles/files/sogetatezuro.pdf In PDF document text
    • https://www.profiemg.cz/upload/ck/files/41552706511.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/buwova.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/53859423219.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/mirapadorepexiboso.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/388e0b3d659c83a6109ed3169cfc7f11/wisewozoxabujiba.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609034e27f91b---juruwewekenuridebuguwino.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/nimakolanezub.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883cd4ff4f---34074220217.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/mokapupipiroti.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/94bcd25c19221ef847667a85612b6c95/83818825259.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/nufubodudonexuboj.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d12ac20a5a689e3c3709c36994426be9/mifuxunoweveneke.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jipixizaxutudorevumavazo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tgv5r20peai55f31qs5rl0bikh/givarosu.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/savipijosomilevoxojotad.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/55650061038.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c52334c10602a058a222c39cd39e7175/74369476493.pdfIn PDF document text
    • http://sgpeo.pl/users//file/56151380592.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/171814b430d43f81e07f7bcfd223ccb1/paranolezivaxepoja.pdfIn PDF document text
    • http://esejsc.com/upload/files/88775110875.pdfIn PDF document text
    • http://absigorta.come/file/24598029455.pdfIn PDF document text
    • https://windsbs.biz/files/file/83286641989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=border+terrier+and+pug+mixPDF 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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 18976 bytes
SHA-256: 8f1905043ab4101d5b10373a9a678aef2a4c620a2bc1889d2642c82a6e65413f
font_01_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 10776 bytes
SHA-256: b7fe1c7aa0ee8e26842b08744d5ac5c32506a0e33c0f360378eed9c4db199589
font_02_sfnt_off00013870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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