Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eae756f7ebb7f6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 02:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b21e981b16f91a18700bbc5661bd18e8 SHA-1: 5d125d6e7e2c8ecb4beef09ab5ef1157f3e9414b SHA-256: 35eae756f7ebb7f6cfda75a46c575481e5f610e154453414cb5d20fd72093f2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple external links and the PDF structure itself are indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://retake.dk/ckfinder/userfiles/files/87988095281.pdf In PDF document text
    • http://otvorene-srdce.sk/userfiles/file/97706339073.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/93189742197.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/fosizilewogitowilorus.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/sibutufelerumi.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/57483074089.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/nezoripimunufigisafe.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27672419360.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/daropazobofazaketusow.pdfIn PDF document text
    • http://seamacros.com/upload/file/xeten.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/giropubesutux.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/13879327883.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef79875cb5---67693088439.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/buviliwur.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/zorexorefumeludabuki.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbd6b3ef5---48198566329.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/zusosiw.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/95888877033.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/66459698292.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/64407940245.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/tivipigonofekefetapimip.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140dad742172---wutabuwevazipasov.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/050e56939aa70716b15911c74c4b81ea/suzodur.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/jazodofarafanenekokobope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+root+your+devicePDF 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_off0000bbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB1 10240 bytes
SHA-256: c3a975b89b3acb13b72cba005a14a805d35c283fe1af1ffaff4d2895c1226daa
font_01_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 18424 bytes
SHA-256: c65ae5c21fa762ed56a50914ecccdfeda275664c7c95283a8193efd7ab3dc45a
font_02_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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