Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e356ca36f018d7…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 13:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 84cd1da45146f262c04dd46ddc53df96 SHA-1: 61cc59106d1cef86664aa99f2ea10d6582364294 SHA-256: 73e356ca36f018d714a35b876ad1a718984d6d99b662602983563b5eb3d9cafe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a lure or downloader. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=except+for+the PDF link annotation
    • http://arrhythmiaclinic.com/userfiles/file/20210929180838.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819b39bd63---46816071085.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a151b04f3a---kuduxurajofadal.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/gowusevuwadize.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/mufudigijetoruz.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/butikirebek.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/lizifix.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210911160329.pdfIn PDF document text
    • http://24cvety.ru/upload/files/zubufulalukoneliwuv.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/294348371.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/bepomonofurajijogubex.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/59001552739.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/16390142204.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/japitijofuzebujot.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/79164935317.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/dotebasetakiwawujuzi.pdfIn PDF document text
    • http://nfc.soo.jp/file/43102670771.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/ribokesalipaxapiwisifa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d3c2q1h084hdu3f1f30v5etg94/didovozeleki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c53338878d---86163081023.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/tidaxolaniju.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/midadoxezumiranoda.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140393b83333---kebovujepapuxoduwosax.pdfIn PDF document text
    • 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_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 15616 bytes
SHA-256: a23aa693c76f56c8bb54212af75eb1f3916212737fd5b27ddde0f9f06c7b84e2
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 10092 bytes
SHA-256: 40e0d41e2fbb8e52643522cb17df84eb87815708c1737cdd448c39a0e9218eb4

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