Malicious PDF — malware analysis report

Static analysis result for SHA-256 2442b8f1bf54d6bb…

MALICIOUS

PDF

89.4 KB Created: 2021-10-06 01:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2891c0169f03822fb3f34335ebdd28c SHA-1: 1d08ffee9cb2c1f85bb47761d3aea53c7d77d905 SHA-256: 2442b8f1bf54d6bb7da9a129ddb5c124aa24aa36a289c161eaa3902b03fcda8c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=to+some+extent PDF link annotation
    • http://td-mg.ru/uploads/files/texipexedu.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/moduru.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2a65430979eb743c7de669e631689440/jitorunivodulemurezoge.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/16009700308.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/41540552711.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f663412c3e2b5f8f7df9a6822fecc68/65388681856.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140255604979---62678890483.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/mevomabosogiv.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/4758928814.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e297e447e8---bubenugumonegi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161592f4a014ac---bovunulafunagovowilugepow.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16140025853781---tututatobama.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5c554c5d---zediwisifabulol.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/89810550449.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e466645cb2---32965410924.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614864533440b---59161149248.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/87344768421.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/13838107196.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/rufariluzajevidiribedixob.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/sasukazigadaxunekuwofujok.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gubulixokamesotax.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/44190386166.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/30941458669.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bisugoninagirisimewoxibip.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/pexoxekezetezen.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_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 22628 bytes
SHA-256: 355b8b80f1151175b51b22d20a1da25e5d0fe10517d4b012cdcdf6a6dfa92770
font_01_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 9936 bytes
SHA-256: 9d927c0deaf7e203757675a23ffa2dec09513ae5f8cabbe607a98a0ac556cfbc

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