Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7300b321ad5313…

MALICIOUS

PDF

88.0 KB Created: 2021-08-31 08:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69d35bdf2ff8135196f48843973b15f2 SHA-1: 2e01bb15b845f610dc552f093c0275b9839ca7d8 SHA-256: cd7300b321ad5313608b56570d6acb63cae583135260e0b119ad715151585884
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c4a20cb3e098a50a09a533aa260f39cc/47368668599.pdf In PDF document text
    • http://bmsorganica.com/userfiles/file/64245242273.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/84777201669.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ab16c871b44411674bb9087d92b13bf0/kutelegekuta.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xemafuxivaf.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/63010863500.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xutitetodibufegeramir.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/panamelisepegukufuzuxi.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/41703105485.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/67787418482.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7r4bc84287jaioudkp4n0tdope/rowikovifopisabirok.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/pududadufotaxisusabolat.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d016106bc80eb3157d7a6f0c895b9e7f/61006286687.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/28528436397.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/51965da71aa00078dccfe3ac831643a1/28155551214.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/79962817502.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac91d9870---lebimarodusa.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/pototilipobed.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607802515b9a3---18267167051.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/934634176.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kokibupeguvogatodimafugel.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e6f7f33b2d8415a80fd03b01e9097ae5/41073171803.pdfIn PDF document text
    • http://kingnature.ru/files/files/niwiw.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/68448588706.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/newatulabukepiwobetof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=heat+transfer+application+in+daily+lifePDF 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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 18548 bytes
SHA-256: 7e6fb46a42e8d21a615bf3fdbf961f73ba22b22ebd7ba5a138b19d4334de1337
font_01_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 10716 bytes
SHA-256: 68ec16805d4c3b050d7902b7db98754cb76e03a54864b89df144dc993dc2087c
font_02_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1