Malicious PDF — malware analysis report

Static analysis result for SHA-256 d648cf8a902fb141…

MALICIOUS

PDF

74.1 KB Created: 2021-08-31 18:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9a530bddd149673d581a0ad455489007 SHA-1: 3a9f3710b5995eba7d5f470b408cbb28b2baf41a SHA-256: d648cf8a902fb141011f817cc5bd22077b2444fed782ccee314ff847dea47703
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The document also features a link farm with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, indicating a likely phishing or spam distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ruben.pl/ckfinder/userfiles/files/96807789592.pdf In PDF document text
    • http://progettarecasa.com/userfiles/files/wevubasisulijulu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b8c8daee2---68750991399.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/13964515641.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8345f3c516---10319462506.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82344e125---96526417543.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/medikenevukilojoma.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gojegivamujidilupav.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/butobufidoxidonamimugomef.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/h82duj5pidsa1jcnbq7k6lbnma/zetikalumib.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099508793580---tetipexez.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/nipubumuganefu.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/67653302297.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/87848431102.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/9596104355.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/rovudezi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9k699c04ktrbu57fro2rve2nk0/11086506547.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160803aee21d7d---dawilixadekedijenulefin.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733e6f61cb7---databulupabo.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/7365103048.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608991ae1767e---61963053368.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a32d26b6d---jizilujed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=department+of+trade+and+industryPDF 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_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 10828 bytes
SHA-256: 58a8594c7aa74edc69cabe727f9eb0ff1f392c459fe891cab98b415f7434f77c
font_02_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16864 bytes
SHA-256: 897fb6214239d234ee9f8f6af2ef8df75963d3c3fb88936d892e77c0c0009c4f

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