Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3aa6e4b14217a1…

MALICIOUS

PDF

82.1 KB Created: 2021-08-24 16:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76fc25470eb2f1940c5328caf8d50b8c SHA-1: abc44c293ec01c634ae0f9705e3f4b8512eca968 SHA-256: 6a3aa6e4b14217a12deaa75cebde3c7e60c3d614fb2f6e38d46cebf5c2024e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute or host malicious content. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaca738028---39298397488.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f95d55d94c8---janir.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/78477367665.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/38656165877.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625183332305419.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf895eeb913---8043814274.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01cf8e142f---29798491734.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/56074163966.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/takujuwov.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e26082159---72876373555.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/vopezavenapewilufinobe.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/vawizotonurerevusetamolox.pdfIn PDF document text
    • https://wineart.online/userfiles/file/vumilawalopomadizafu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/biborolosukadobuximan.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef32bbaa75---fulog.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f6c136bd5159c20b5079e849cec203ff/14368879609.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098893b0da3e---pitiwafugas.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/75950d12f45d5371c7009ff0fea9a948/gikef.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dacc04aba2---ragin.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b20df892c09fd17154abcb8ce53a2a1d/11071721985.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb33219f04---60545377524.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161042bbbc8b4a---sozesipuzepamulijegobava.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202108180428075521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=evans+income+and+expense+statement+answer+keyPDF 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://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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16944 bytes
SHA-256: f6b017730d015ae7ad3990b3e01c12b6c6e28a3e1ea327c5f69eded740ec0a75
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 11072 bytes
SHA-256: 3e9f6f951388ca45d22ff5fe1065b8992764d1f153ca561b9f4986700047988e

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