Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0428642d4f2f5a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 10:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9521742535763da0165a944b75ff33b0 SHA-1: 20ee52f2b7ff68467cf47d4a6101cafb19a189bf SHA-256: 2a0428642d4f2f5a023c0118e8d26bc31d109a04b7c0416e96ec3f2f60b11ead
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or phish users. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f8905a6f3eb78d5cc5573c8e3bdd44ab/getafalixa.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad467eb909---jolivir.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/43123532249.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/fofagiribib.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/10691267744.pdfIn PDF document text
    • https://ms1oke.com/contents/files/nuzudafubile.pdfIn PDF document text
    • http://pedraferro.com/files/files/53940953246.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/pivoxejesap.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/narugosunajumizogatad.pdfIn PDF document text
    • http://elsped.hu/files/file/fomurebujikorakelixo.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/gedes.pdfIn PDF document text
    • http://edeins.com/userfiles/file/7516096359.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/digarubereporufirores.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16145d724a5506---desatesewi.pdfIn PDF document text
    • https://kimcert.com/E/file/13323941694.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/50868667339.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zemejokir.pdfIn PDF document text
    • https://jobtiara.com/files/files/motemiwirosapaw.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/xedomafeviporobapugononim.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/16718890296.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/furilamupudumajema.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/26731227395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+online+movie+wonder+woman+1984PDF 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_off0000b0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 10780 bytes
SHA-256: d35dc33dd62fac134c2b8b35768dbd058d3e7633c12e9c2a471679f367d682f8
font_01_sfnt_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 14956 bytes
SHA-256: 033d9650e9e22f127ae48ddd33bfe9687e2e9a7f7a48a651e198d938ebf5bb6f