Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd572cec79abf73c…

MALICIOUS

PDF

85.2 KB Created: 2021-08-23 12:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d33b210fe0e5363fd172061fee3f460 SHA-1: 94f653efff085bbafb8cd33f2f0df6dcafe2af75 SHA-256: fd572cec79abf73cfd6876ae669956b022f0794348d9239fe40aa6b72d591711
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to construct a link farm for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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://spec-so.ru/sites/default/files/file/guwileluwazafev.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9kf8ddvjjt8mnqb9l431f2qged/ginoxefisi.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/14409971308.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b07534369---44607283914.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/nenavavilaroxasukazur.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/nuvitukimumozeja.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/valumoretuzozogu.pdfIn PDF document text
    • http://15881588.com/ckupload/files/75488782022.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e0b4c964---vebopemowenijode.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609458760173b---guvubemawatid.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96781e6f97---waxupabopuxeves.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29306cb8f---surizowolore.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fc553cc12871739a0908ee5558cf59fa/27257884758.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/30301523096.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/63676230349.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/64480238160.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9cefc39cb---99114115125.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fn284sehqc4mlo210cp24jnl64/somiboxerudiwek.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/vikoza.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f709d7b76---zobezejitedepovedefawibu.pdfIn PDF document text
    • https://buka.ru/sadm_files/dojuwugifu.pdfIn PDF document text
    • https://pecsikult.hu/files/file/wizul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+story+of+noli+me+tangerePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b06d709ff0e2acca6c9d8553ac7c9cbd/51874852149.pdfIn PDF document text
    • 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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 10736 bytes
SHA-256: 5c67ca94700c6071a46deea8638c7694275c3c1708da51504e099cd5c8542864
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 17404 bytes
SHA-256: e79084b2ecefa7313ac4d56d27a32e4a7374b84d57d7c308688ab21042783e2c
font_02_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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