Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9308e6256117aac…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 03:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51d2528243ae771a10f9b240d53153f6 SHA-1: 65fceda1e7350e86eca3fb837e0d3b9a3241aeb0 SHA-256: e9308e6256117aac61e1b598e90c77ff2749fc6d5cea2cd4c4fed773f8c8a257
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple URLs, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to obtain a password for a separate malicious archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=group+1+notification+tspsc+pdf PDF link annotation
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5766732a---46603010087.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/54315068144.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a498e4ca0fe---golarujatapogovu.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210721181904.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/93375683359.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156cfbf3e03---xibagutefowamakovakajig.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///sazofodilabulixusajen.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c7039b00---tepaxurukizurirowafit.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/retafelibasuvinolafuvep.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/u452m0hvtu2sgcj4ttr8rohki9/45558774806.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/19613285142.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/norumanodasoxilavuv.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/77258999642.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gejajalekazaw.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/dosowowaro.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/kabavejikazezexeb.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a955de04eff---13712780527.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/30477179803.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/givuvodaxaleseje.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d6c104f18737a7da9f9e0d47abcdb48/49218285821.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/mefetinosugituvakaboduz.pdfIn PDF document text
    • http://iphysiology.ru/upload/todubenasomebak.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pvpitvudltumkra72lc6jbki5j/fajabefaj.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/hh7bp4ov42ouofop9v7gvja80h/vosogovijitin.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_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 10628 bytes
SHA-256: 6c6b291b39f0f9c41ac8d306f737b07628cf341e39f9672e7d16bdbd9c365740
font_02_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 17644 bytes
SHA-256: 6d7bddb426674f62e7406144aea623c57a96b41ccc33cec91db13ae9520631dc

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