Malicious PDF — malware analysis report

Static analysis result for SHA-256 11223700eebd430d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 08:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf4cb8d63a16617f33552e0a2abe5d3a SHA-1: 95304e19e6d018ed7873ee291a5e1f176b95e9a1 SHA-256: 11223700eebd430d89e15c490dad3e3cdb2762e1243a339c099a9266f9af982c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to external websites. Several of these URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://allytemp.ru/uplcv?utm_term=living+english+1+exams+pdf PDF link annotation
    • http://redondoclassicburger.com/uploads/files/xuxafosinazulakanobapote.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc2b132aa---48288352521.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q91qlean6hm2dvp9fs12r2ngv2/sujonilojen.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/pedopi.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/78166563323.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/54980524505.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/5923799244.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/dovofaseb.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/xiwevuxuzodevavebirosi.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/zuxoxijatukanuku.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/47993890756.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/64106159724.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/99912836262.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/24831296354.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/87891487377.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98bd1a2df---redalibivula.pdfIn PDF document text
    • https://clinicscrm.com/img/files/90245195908.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/zidunuzador.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161305498b7222---83946348148.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/37933355081.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebufunemomajapupoxafon.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5f6322c1eea99d55b3cc71bf580be1b3/91110746042.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1d59ee2bf---44768846749.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 18240 bytes
SHA-256: cb0bf410f42645a3759fcbbb3536264e6876b070a671ed723986d52b39b8ff81
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 10804 bytes
SHA-256: cdc717b53ca2143b8c73ec6d9cada7e5d492f198b1024a3c2742e1083c54f92d
font_02_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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