Malicious PDF — malware analysis report

Static analysis result for SHA-256 236b4f73dc0c5f05…

MALICIOUS

PDF

82.8 KB Created: 2021-07-18 20:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 870549800941ef5f90027b367ea07375 SHA-1: 6c0b7e30bb82f0d6a475d4fcd8f89c42f5d37c67 SHA-256: 236b4f73dc0c5f050e19f2322499790bbf87d411e88fb56d799e974d7dc1c061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on compromised WordPress sites. The presence of multiple URLs pointing to such sites suggests an attempt to distribute malicious content or phishing lures. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa631c787df---geninanumirubutowajame.pdf In PDF document text
    • http://abwlanham.com/uploads/files/78752427813.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e511b2025309bb5df7f04fa49eba8699/8646037288.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2b26cfdfc95b9a6c73afa44de7ab634e/jamopizebuvemezaseko.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb0b6f68dc4---13832844645.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kpftv02hm8mt2ebfes770ora57/kujusosuwarajetiditi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c40759737ef20bfd8aef12f594fb86dc/jipuwuxupodurewukatowegoj.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fodulat.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/botibokaz.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/kuvazaditaraw.pdfIn PDF document text
    • http://healthywithhart.com/res/file/rorodurebewinigasudor.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a330c554816---suwadusidi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ilclka5d3tfbg9vpak4cq6bq13/3966548443.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jbti1gk6d9eu7t5c8q2vi6vql0/turawalonupub.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cc29824e---sejatixuzasinumapo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/20807508649.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9998f512---dureku.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/nujejexazojerimabitifet.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/tuzezarekiwowis.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/jimipava.pdfIn PDF document text
    • http://teraval.cz/res/file/sifunavilidujetemifiteza.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1ffa7828---jutare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=write+each+ratio+in+simplest+formPDF 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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10736 bytes
SHA-256: 4da0a60c28d7f49b95750d2a2e1eac4bf3cce46c6695f7e1baf64dcaceb5592e
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 16988 bytes
SHA-256: 5478a5e3912cc1d506c54d937f8ad11c6fcf47e180f5ae0b2d6846838e094aaf
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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