Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8a77a4108f8722…

MALICIOUS

PDF

76.3 KB Created: 2021-08-24 19:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc39f578c37b07c468bb78345cc59c9d SHA-1: 9b8ae9e5e407f28bfc97e5c5b319a9315f6ae065 SHA-256: 4d8a77a4108f8722571daf5e9ae89c7a00d3bc0a1186468bc5b922a07b509184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. These links likely serve as a lure to redirect users to malicious content, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f2164ad478f9b7b5ef2e3c28d55bcc4e/16841286713.pdf In PDF document text
    • http://h-st.nl/bestanden/files/16082315830.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/75618141.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/6497392719.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9450e3fac---duraranewaletufupi.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6051d929229853ff028ac70c282ea681/48959377753.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0fcb46bc875276777d4d608d9f9a2279/lofogisopajamusege.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/pufax.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/vuwogajorawenezujola.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/26967473759.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e51c512402504ea4d9bff555070dc48b/jovezomatibisowodefomuzil.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/rifed.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f62f5355b---67020995946.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1e05fdde726122739eab0917d3dbca7a/ralikuvopolifebura.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zenotukuvunuf.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7eaeecaecf1f05f109b3576c83d84099/jewoxaxijorasor.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/7272050948.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83002d86e---godorebuwigeb.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/75659451604.pdfIn PDF document text
    • http://dhf-china.com/d/files/27849035471.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/51427911227.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/zijuverijegeweziladupovas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dusty+springfield+and+the+pet+shop+boysPDF 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_off0000c41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 11132 bytes
SHA-256: 99b31a8d99de1060e4780c983a338f25336cd76b24bb6279118cdbc4d0d662c5
font_02_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 17680 bytes
SHA-256: e6b98def2905bac33433fa6bd19e4503ceaa26b7e7627de4764ec8152ed84fb8

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