Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fc4931539aa7ea…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 14:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98d1b24d9ef53a3209649373fe41f295 SHA-1: eddc461fc3a4b1f3d52491c628078bbe566626c8 SHA-256: 54fc4931539aa7ea3ea4ef7cfada95b46563843a7fb35fddf784af77c9a91e3f
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. These links likely serve as a link farm to distribute further malicious content, such as other PDFs. The ML classifier strongly indicates maliciousness, supporting the interpretation of these links as part of a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://irlanc.ru/uplcv?utm_term=shadow+fight+god+mod PDF link annotation
    • https://mimpishio2.net/contents/files/25016576480.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/zebotikarukedumigifejumo.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/mizexajutig.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210903131940.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/gozebenejaf.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/75543609509.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16136b5e1b51cc---50729324488.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/44262468706.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/20114888727.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/lativoju.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109010947124708.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/80021159562.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/45540121040.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f1d0bd598a432ec20713ab5bf389954b/38325641722.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pitizafemufofolifuze.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zamutexerekelajewezomekos.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/jupijazaxesasarimas.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/57980619422.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee01590f85fdb0f346718a76137f3633/79888597987.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/02939577b91f44638b4b37725bd4e783/jadeniruriwabem.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/60333814456.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138441aac4e2---93032649425.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/muxobiwi.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_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 10412 bytes
SHA-256: b2404129cedd098bd84baec43c9d04f7e473b3ffd7bbae4747eef3fc4d961791
font_01_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16788 bytes
SHA-256: 33eb1b5c353d787a6f3e261b0d931c6ad164c4dcf6a680c65278ae10249d43a8
font_02_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1