Malicious PDF — malware analysis report

Static analysis result for SHA-256 6748891d29737690…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 626e9c7e7b391cb8d2dec7b1531bcfec SHA-1: ff531682609dc2ef9cb4ecf588dbfacc3558b86f SHA-256: 6748891d297376905cbf60dde39b02d43e19fc772f88d03da68cdaffc42d463f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites hosting PDF files. This suggests a link farm or phishing lure designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607597596c9cc---11902162724.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161248728b1e3d---22217456647.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/4145533149.pdfIn PDF document text
    • http://jfe.hk/userfiles/sadevomo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16084cfb5b3a1e---47517878983.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/kagezomegikukob.pdfIn PDF document text
    • https://xigmatek.com/upload/files/67141681377.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612de8979ddf9---2039701111.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/82688230982.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607949a6d33cf---85351609486.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/doponimu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3sngd3dgtvjq3p3knkrhadb69/57263281195.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2e14ff2c5fce022860ce485f26c4b989/61766308727.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160826ce8c22dc---tepesufonutepusunonuw.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c49b817296---kedezog.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/73545669739.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/16697744234.pdfIn PDF document text
    • http://levotst.com/uploads/files/sasozitawinezesip.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/83054808233.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/64142119690.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d374ac166---98224448603.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/70b08d63183c7e1c36bf1aa79270a3f0/88486809093.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/34837692542.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jalufeliwuruwab.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/wozanejonexom.pdfIn PDF document text
    • https://12shio4.com/contents/files/8854368473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=il+gardellino+vivaldi+pdfPDF link annotation
    • 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 10424 bytes
SHA-256: 6fbd11f7f6a4924a3e4d75c318f354c2d097f64abc6fc3ddd04829a94a9b418d
font_02_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 18788 bytes
SHA-256: ce99d67ea0e7b0c4077afc2bc24e2a469ad0ecfd39feb07a0584cd3d9e6f1500