Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e5743cdee50ba0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 20:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eaa39cae7c14d6dee4483915814dae7c SHA-1: 6f537c08f95dca75d7d6e2a021cfd3386cb37906 SHA-256: c5e5743cdee50ba082242c031260e94861d00b73b3c4167f63d9261298388af9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate the download or execution of further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=let+it+shine+full+movie+online PDF link annotation
    • http://lex.tj/img/file/51855318571.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090307041837.pdfIn PDF document text
    • http://grossbuch.com/upload/file/42125213376.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/6744338709.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/91714778366.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/5217934107.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/1411378209.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/dujovuravedusafolipob.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c6816a7e---tigilasilogezote.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/mapamiridifovexuvevade.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f970644160---zezomebisalogupozenoforel.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/26474668918.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vm8btlcb6i35doo39m9vln4rt3/bemexuwomoduzatobiwoju.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/39790786377.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161425b0610bde---zaxotowukiromejemupog.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/vokunut.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/34392875448.pdfIn PDF document text
    • http://reflita.lt/uploads/files/95600586510.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/xesususumomurakigu.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/16994665093.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/69189169994.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/8060347391.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/zozepugujorepatumavu.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_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 16936 bytes
SHA-256: 3c7fb075d5774383488ab9b55a2da8f5f5c382ef29a62a80df9568f2b03835ac
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 10340 bytes
SHA-256: c95b2fba729560f3fdf3c4b4d8cc21dc55741a91fddf8774b514b4013cbfddac