Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef85c6738e8b1ed5…

MALICIOUS

PDF

129.1 KB Created: 2021-10-17 02:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e115b4b6000b3f9d4947ac9fbb0aa5b0 SHA-1: 12d5ffb5ba2316421a4949aa5ffd469d6cd84b66 SHA-256: ef85c6738e8b1ed5a108e8b57bc1fa7bb012c85962e583a3ee1c84af46e9a9a5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to compromised upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_JS and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a malicious intent to exploit the PDF format for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8446

Heuristics 6

  • 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
  • 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://loaamtran.vn/files/usersfiles/files/suzobozib.pdf In PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kabixibiruramu.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mekupevorejodobemu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/simakamenugor.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/12687433051.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/71633366837.pdfIn PDF document text
    • http://topstec.com/d/files/70803685887.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16161ef633e5c4---58197610412.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164a65fe06ec---37679542172.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/jejidudaruxemurikaba.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/banefevosazujawutasajenor.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/99913888568.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/6082281380.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905122139.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/xunonevubuxu.pdfIn PDF document text
    • http://ktcz.eu/files/files/99614129201.pdfIn PDF document text
    • http://glbrsciencefair.sfiab.com/data/userfiles/file/fonipeku.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4d7b9204---37196599538.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/60035866271.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/1369969406.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/rusubukudagudi.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/27241960038.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/pomotamunukanudesof.pdfIn PDF document text
    • http://protok.pro/upload/files/83063632202.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/22274218893.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=how+to+make+a+secret+door+behind+a+painting+in+minecraftPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC82 20120 bytes
SHA-256: b1de4be001fa588533a29aa531dc8522c946404cef44185897e2f0f10138fc4b

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