Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f80542c1a9c707…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 22:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82308e9c8289a84e5205c4e6cb134cc3 SHA-1: a45fbbc27399977e96d6423365adba9b5917e67d SHA-256: d3f80542c1a9c707468ced38646c3077d0f14e309fe2a8b714ff7ca400154a21
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

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 https://coretry.ru/uplcv?utm_term=watch+the+good+fight+season+4+online+free PDF link annotation
    • https://beldaoyun.com/calisma2/files/uploads/26967264600.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/59954285118.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/fudonarelo.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210901102557.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/tubemogazosuv.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowowufedajikelamive.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161323a2d1788b---99902855591.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/beliranoz.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/82356563217.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52a7dcefd---zemumapi.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/pavafagevel.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/ximovu.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/jowaketovira.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161370b7478234---19283727612.pdfIn PDF document text
    • https://rubfila.in/files/file/90055866338.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/37677738231.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/ronerononovinovigod.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/2193850799.pdfIn PDF document text
    • https://tadimtursu.com/image/files/fugefevuzukabomirudufuxum.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/18406462664.pdfIn PDF document text
    • https://rotitelor.com/contents/files/19638196745.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/52662755899.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/nosutizubosivi.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090412504173499.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/93899580069.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_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 10828 bytes
SHA-256: 34835495e3a4092559ad1b2700a81c2415916ad07ada2d7e8cccedfbff7dc962
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 18388 bytes
SHA-256: d9355a39cf86cf18d08dd0a85978d44fdfdc5adbba98f96b59b0d213382859aa

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