Malicious PDF — malware analysis report

Static analysis result for SHA-256 90faa27102c54c99…

MALICIOUS

PDF

72.0 KB Created: 2021-05-06 20:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b52a110f8d37e72ee9f8bd8ad4a937f SHA-1: 730849a138950af01db074ef2ede9bb6d935239d SHA-256: 90faa27102c54c9947bb7c4fa0e496f23e4ad928a3594f59ef0b5d95a4d107d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs are designed to appear as legitimate content but lead to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f19489f7---38026224015.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092472091e76---16934726622.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e4edf65ccf3df5f9a5561fb011763c1/woxupebuv.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d2be00a62a9290301ac65b9aa8f35cb3/85708879309.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/28b30c4dc23ef41f44551818407e996b/97463499666.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079479bb24a3---kinukagis.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f717950d1---tidigevowuwar.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae212ea4c2---rexukisadakukovenuk.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/630d548e693a0c00ff899bbd9e054a07/dijidilewudovofisunupix.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739cfca1e8e---692827992.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uo0sn6fmfre1gjk9ejv3uj8hju/jomerivitu.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9651678fbee8f23363cccd265e39d63e/12877565137.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0588e510---98117501242.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/56vh9qjafb00nl57m8bg8va9hm/xobifarivalulirelu.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/kewala.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/si1gp93l35j4448ijnt83q6cb1/gabitewoxevikum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=baby+funny+videos+clips+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de11.bin
4f9f66ec165ec1032f80d0d9da737d969757af87b02690c085d0c7bcbea74acc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 5500 bytes
font_01_sfnt_off0000f0e4.bin
0dd03470645a44ad0f136a6bc81c3b8300d76c3a09a96598208ac709d68c0a53
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 10008 bytes