Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e7ba3c96fba83a…

MALICIOUS

PDF

100.8 KB Created: 2021-04-28 08:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d59c3138a1593d744c5e278bbfd35c95 SHA-1: 6ef6757ac1666fcf8c833a1981b53a8ba2af4f98 SHA-256: d5e7ba3c96fba83adadfc889c2051f8537ed1b4b100e6273392207846b43dd52
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm or part of a phishing campaign. The embedded URLs are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and URL patterns indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607534a2854ec---36708716197.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f0fc33003e2496b1f446e0aa90ded2de/36613177220.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b99bb903956d91a2e4766125ef355907/61659666993.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069a2bccb8---fapilazixareg.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69fb17455---lapokuxefeburesubug.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705e1ef0c1b.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef8e15311---83576087626.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c289bf589da81cb182c1828218efafed/lobetosoxizapinexo.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/bofopapapodana.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a5a3078bff610a097d5de4014ee730fd/fasenuvenebop.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4f1ca8f3---2056724295.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vgi5cjcslva0ftvm86q618nbh4/96428454147.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59c41349---ruwizazukaninubojineg.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/81087c44b0f3964ddc300f9c2e03aa0a/91292744145.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087febd0b2b6---rafolegipuxeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=additional+mathematics+form+5+chapter+4PDF 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://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_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 3096 bytes
SHA-256: ec474928f98f58d1c2d46ee752c865301238f06294dc078591e694ef4c3fe283
font_01_sfnt_off0001303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303F 5596 bytes
SHA-256: 0f450d67994594eefdad776049c62e158e129232ce77c61d35ba4c4a3fcc64d2
font_02_sfnt_off00014323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14323 12440 bytes
SHA-256: 80e25e61089a69720385173b1c9a7311276c9da9334ae43f55b34bd6421aeab0
font_03_sfnt_off00016e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E03 16312 bytes
SHA-256: 4f2e9a0b9fd3148026e7a8e7a18641925b17467d10809b1c540f2984e3db1b2f

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