Malicious PDF — malware analysis report

Static analysis result for SHA-256 813c8b286fc9f582…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 22:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24c0a3bc47f7da0f2422d7e3dee5ed61 SHA-1: 020102a9c23cb07929a9688643496fad1a8b1573 SHA-256: 813c8b286fc9f58289294d292a78e21eda7d7c67b06bf97f8fd4b7e1de7f0654
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://naasschoolofmotoring.ie/fckeditor/userfiles/file/60577204940.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc09492abc---botanuvebiwizenadawip.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210723123212406089ys2oi.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/xofatep.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/94728653788.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/barobalunurobuwigunes.pdfIn PDF document text
    • http://fields-on-earth.com/duzatifagumiwudisetekijum.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tegomimedujawab.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a232125c344---62738270340.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/74382019434.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/xuteku.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/lunino.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/kufapidajevositida.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/57077098934.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210815122408.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160807dd361532---nulokexelewuvotenixa.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/borejisonedebikorapogisaf.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/84b5c0760f9bc9a38a3e2946bb52e2be/serelugim.pdfIn PDF document text
    • https://ntc-container.com/upload/files/tafitiwedozusazupavaja.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/e1i9iqmlh9pk376t5tdktthv2f/venitu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6177c03c---90731802365.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qnkji9fojme8mf9nmb8epjl7b4/salapasaf.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nulujixemogatenotisumube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=brenton+septuagint+translation+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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 10824 bytes
SHA-256: 8ce794c68d3dc0cb4af85611c5126bbac5007150c6ab5d115e1bd9d689c6f5eb
font_02_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 17416 bytes
SHA-256: a419e3c678103dd7ba8e362f09375dd2afdeeb6bb2d9da6fd4039152ef7b6cf4