Malicious PDF — malware analysis report

Static analysis result for SHA-256 222b432c73f37c70…

MALICIOUS

PDF

82.5 KB Created: 2021-10-13 17:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c303788c9daa9bd5daedd705b8c5ed25 SHA-1: 507f552e50c248d1c7954681f8959f891fab12da SHA-256: 222b432c73f37c7040bf1b7ef19d1d25df99cf52bc32d38f59f3ec1dfd299314
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on disposable or potentially compromised domains. Heuristics indicate this is a link farm designed to direct users to external content, and ClamAV detection confirms its malicious nature, classifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged the PDF as malicious. The primary attack pattern involves luring users to click on links that likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=flipping+back+and+forth PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459a635b321---27640920906.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/gexopevozevokakomodavu.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/15577720074.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/rozeme.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/tamenoxudola.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/tuxalumurujufogogedam.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/55701093162f83eaed8553f6a7d01712/11606950896.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480cdaf1301---rotokuwuzovijomosetosufox.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/vexadosoviledudif.pdfIn PDF document text
    • http://cosyromania.com/media/file/memupefodinabugabi.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/votapajuziferol.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/poxez.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/89695380253.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/remodomekemelukap.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/31053077439.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/fogosadanikigakobubu.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/67861945018.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/53536769407.pdfIn PDF document text
    • http://princeverma.in/uploads/files/31204184353.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/wedutusix.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lejabewa.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/gitesubadovojezifonutezes.pdfIn PDF document text
    • http://greenglobepms.com/uploads/gaxadufugirupuwoxeked.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/fefupotiju.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/podavuriximiru.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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10808 bytes
SHA-256: 21f8a491d421ce40c7a84ea04bf9463c37131d976345464590fd51255e8675bb
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 19316 bytes
SHA-256: 20fd49e063187877c18d4af15447be8e692b47ced4f97e78f678b251d8f36a16
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1