Malicious PDF — malware analysis report

Static analysis result for SHA-256 e817fccc0375fe4e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 15:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02f837662129c93091582a746b38686f SHA-1: 3efee371d66c4ea83bdeee63e242f839a4cdd2da SHA-256: e817fccc0375fe4e65bfc9198c5b76ff52ad4003514814634f85bb06a15e0eab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. This pattern is commonly used for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=perspective+of+modern+physics+by+arthur+beiser+book+pdf+download PDF link annotation
    • https://weishinclinic.com/uploads/files/202109140336331022.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e4f3aa636c9e193c898458f7e2da14c0/debitexemide.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191323643663.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/zapisozumu.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/14/jewijugibezixagamos.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/4956345682.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jemajuresozomisap.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210910182233.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/97966856302.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/62400155477.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda47bfaf5---8117238901.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/wopokosekuxilofufod.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/sovojupifajamoli.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/87757525347.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/dejigurerudelegitene.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/36015068220.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5aa49c8d---goxukufupo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613270fbcf8c5---foribisojuzikevadosavutat.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/34480718773.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8d14fe9c---9575034017.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/xifenunexudufujiw.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gividejarewaporivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303eb3f19e0---65681520498.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac08b1d3a---86188166056.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_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 11484 bytes
SHA-256: 7f8b37557a46d6f70e8410064aaf9224da15dbb6ca1e4d78505127cd66944ede
font_01_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 20496 bytes
SHA-256: e2ea6d1437da5aebc7980a63b2a2393c586f27e0114614b27a5f984cdc5c9acb

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