Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ea1c213c6fb193…

MALICIOUS

PDF

89.7 KB Created: 2021-09-15 15:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e0d506a0067a88dca99b6e0decac413 SHA-1: ecf3b11a69f493fcca5a5a8c206e56dddda71718 SHA-256: d3ea1c213c6fb193f57e6ced2ccdc562c42dd5e85e3c63276ed968479256a1ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable domains. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=how+to+unlock+xiaomi+phone+without+losing+data PDF link annotation
    • http://anbao.vn/uploads/userfiles/file/sebimetegisodokujizagon.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/34746421078.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ad9114cd34580e15072697c9b0e99acd/62566013378.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/nawazarozobawid.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/roxusena.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/36623218880.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326b80506b0---kenilimuputimolorujosil.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd8eb5f9f---39663374278.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/12561409768.pdfIn PDF document text
    • http://allycatering.com/userfiles/55272128937.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/botudivokaguxedidopuf.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/68291763420.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/86985640235.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aac8cde77---12217064121.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3fe83633e8ecf8076a3f58bcc136b1ce/nevavuje.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/80759331775.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/35198127604.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/93463753946.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/52379979091.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/44989604058.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/91003935714.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2fa8a890b86caf80ab08287b24a5acbb/desegobizimux.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_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 18028 bytes
SHA-256: 25eadc730de01337c3671a7c9fdc6fa5262756e5c02e67875f4ff2f7ef95a1e2
font_01_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 11232 bytes
SHA-256: 844837a26b1846b85fd26686eb0baba06cb6e74eb9c4195a128153b2dea431cb