Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9b3130ca161563…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 10:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cae21a0d8ab0ae2f004329af874ccae SHA-1: ba4b495dba4738ca6226dfae4e4aa33c2c5c0dd6 SHA-256: 2a9b3130ca16156345115fc07b0020aaa2dc1a3216148018947884ec67850db7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://carshopm.com/js/upload/files/83513395418.pdf In PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903124813582.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/xavokitokevekasilipokug.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/75284087183.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361bb7e8f61---3673432012.pdfIn PDF document text
    • http://arablift.net/userfiles/file/munugakilodorulewodesetu.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/64363529429.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/94571981899.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/uqhsht2tmgvqkklhhmu5hh22t0/pedirelas.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f25e006536dcdf6d3c9733b674e1e560/91164783822.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/xigugunaxemevuruje.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7ef92ea5---26467759636.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/gesiditilozinediwelonidez.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0675a5070---kubopegiw.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2826c0c10fe4fadb95114c52b18057a0/29088273983.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/etoioaedb107v5ccd6185219h0/85389878036.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/29333724742.pdfIn PDF document text
    • https://kratky.eu/files/file/rulanudixoto.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/mudoxodem.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/libaluzisigal.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bolunelowugolegelasebutap.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/37371048724.pdfIn PDF document text
    • http://vinmexindia.com/uploads/zinebulifamitafiwewepum.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613174e284129---31116662234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+put+live+photo+on+lock+screenPDF 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_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 10644 bytes
SHA-256: 937cc8b1bbbfbf1a17a6131321192619f33991af8198f0726b0532c18d70a4d0
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 17552 bytes
SHA-256: 0cd23cf57cdbf3a3e466e79a2246999743c4545f47720b8bcab98e595b9a7424
font_02_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1