Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd82b2035348771d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-07 09:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e585e51df14ad98d81d921343e5f7bac SHA-1: 9e6d7c046aa1383787eed744fbfa69364387f16c SHA-256: fd82b2035348771daeb0df7244b2951bb7710020b22914ef5f4f184d00783ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6dd5216c257bb3a1d22a3eacabce8c0a/81575938070.pdf In PDF document text
    • http://energo-winstal.pl/userfiles/file/51820229901.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/jiniwimokiratil.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/32791113836.pdfIn PDF document text
    • http://classtool.info/upload/files/18261748861.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/jibofemunu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/17422883745.pdfIn PDF document text
    • https://tch.lu/files/files/9021101599.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/vatelijabalib.pdfIn PDF document text
    • https://songhongresort.com/img/files/tesefomomunepojuv.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/bajivinu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d362ac37ee1c5506529eb20b57b88b6a/zudobavegukekosolek.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/27250882452.pdfIn PDF document text
    • https://cet.sk/res/file/67473586333.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/bifaduzo.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/11545605783.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088273ec2dae---xavilugekokima.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/banigurepofevunutil.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/53621124794.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/xigexukixepesivumadeburi.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kokejuvoj.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/80770416656.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2c8f7e20db8019bc36fccb10d91c2abf/wesonusozukoxina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cancer+de+mama+pdf+colombiaPDF 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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 14784 bytes
SHA-256: cea810599db0be70465af16d0d026d9c3f95109026bb5ff8ca6cea399fed6e5b
font_01_sfnt_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 10688 bytes
SHA-256: 041e014a263d1d71c1b6c2a04e5a429cbcab40a0b95eda615000437ea731e220