Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe85ad14335f850…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 07:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a6e7a7da3f882dab077be4e5f57edb0 SHA-1: c1c8886255c7cac8527f98cc93ea6247a610e80d SHA-256: 4fe85ad14335f8500ba0823d9282c4755d68ad4acc12ff742fd169391e208110
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. 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 executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=french+1st+division PDF link annotation
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6a92e0cc---1434864660.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/palozokafurosiwiwavofe.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/92603347118.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/kuxijoxejaxezinidejasava.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/tadaga.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613739e77f3ea---janubuzuwonajup.pdfIn PDF document text
    • http://intertravel.hu/_user/file/kewuvoxofajanokakuzep.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/d8c5bb98214109f23eedfa7493d61d80.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161323995677cb---20057984816.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/suxijulanosinedat.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613162d1d3480---92686352186.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da32a73f5e---xedemerokamegaxomoxeze.pdfIn PDF document text
    • http://bibikid.ru/upload/13387450709.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/vesitipifikufumalidenej.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/94504882143.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/18679069163.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tefasivafob.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/mafusifo.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/jagenebisebokorimusewo.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/30905440822.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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 10352 bytes
SHA-256: 08de91a89d1ade3ad9a320e6e92bfcd2455e02015dd2f006b16efcdd501d7694
font_01_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 19928 bytes
SHA-256: 3d6b8294a233ab5805bdadcd6a8641eed8cd611f92446dc4e0a875bf8ab6b68d