Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afdac21fb7c49b4…

MALICIOUS

PDF

75.0 KB Created: 2021-06-19 17:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c0f904adade3a291970fd40c3285bc02 SHA-1: 8e90cdd687db052b323b2acb138a9adfa98662e2 SHA-256: 8afdac21fb7c49b487f79654418fbbac7de03cb0d39d2855c2daacc61162e157
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=steven+universe+ukulele+theme PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/58170f8a9108bc5970af494b5a512e11/jewewisufitexozuridosefuk.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/zomobirupifosinakikasobil.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/37319075761.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8f3a88af114c6b20d8213ddfae9db1b7/27390483293.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/71e1145adec2c9ae2a81be45fe3453dc/wetuwakesobenirovu.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/ae6ae431609ce75f901b17b932f9b33c/19236386994.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/vuvokezetuzafu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44115e0145---bubus.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/50d86fe292de0cd0887a2fa694077496/21977464934.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/nijomuwanetenib.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/cc28ab009622e0554a07574d82302030/gapefimawejifuw.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/8405913936.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c022246caba---naduluwujexizik.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/53233858156.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/75511482965.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9693e9155d---13985232865.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 2368 bytes
SHA-256: f97d08adecefd89c5b67a2f95eb6ac976e2a6423cfaac833eeb46849689721d0
font_01_sfnt_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 4940 bytes
SHA-256: ea8db1b7246baa55b34b6a9b988e5e28485e7c390c7653fce47e126095b9c516
font_02_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 11924 bytes
SHA-256: b18c2cf27e3d15fa36dd8592af63ddd5c92c7b619a97e66ce76500fea9a3927d
font_03_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1

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