Malicious PDF — malware analysis report

Static analysis result for SHA-256 583be5d800a7e2fb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 20:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a040e63ecb5afb10002043275ff27213 SHA-1: 29e66e36e6a24e9ae2c7540f7111097ef1fd53d6 SHA-256: 583be5d800a7e2fb2cb833f238cedacd737bfa9dc53ed4686c1ddb1228a8b5fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pixomot.ru/uplcv?utm_term=fast+browser+mod+apk PDF link annotation
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/57b7032c8a429635ce127beb20a34ce9/89678999562.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/28526764112.pdfIn PDF document text
    • https://agrando.cz/files/file/7845699124.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/muxutupimimuwafimafo.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/gafivafub.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/17708562281.pdfIn PDF document text
    • http://usmleworkout.com/files/file/96378254990.pdfIn PDF document text
    • http://okvin.org/userfiles/file/pawudawunil.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/28220746018.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/simuzagejasaziwapowate.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/7577922134.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/towiwiju.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613449afc8949---waxivirazanitujo.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/wajet.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/guguvapiluranutido.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f019552b---betabedoxafafezige.pdfIn PDF document text
    • https://denimder.org/resimler/files/54868469607.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/54006295586.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210912075822.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/movofosominerepo.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/segavofeta.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/dadasabedipebarug.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/nopifuwokojupej.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/76340820869.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/74748646086.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/tidiguxojegesozexetaka.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_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 20012 bytes
SHA-256: 7534f7e7d23132cbf27937c9cd13fb3b74bb304cac27f034da837fe8d25e975b
font_01_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 10604 bytes
SHA-256: 8ebb8be2dd69f60bde5abc371ceb69fe88146e26935662f6f305905beb4a12c9
font_02_sfnt_off0001279c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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