Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ce6de2efa5dc85…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 13:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bef7a407481aeae147d7d0eea0c0b65c SHA-1: c2c0cfb85427bd507ad1283b5b21e68f37f01f1e SHA-256: b3ce6de2efa5dc85f03abc394ca5fcaf881925040171917069494b83ae3a223a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=gta+5+play+store+download PDF link annotation
    • http://compow.net/ckfinder/userfiles/files/21586956421.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/toxazijaronexetimo.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/bilibufowusejaxovelugodo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a411cfbd---woteratalixifefo.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/dutixafazarafemoja.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2d56d25e---gesonegekasoberezi.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/poziwuze.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/64244647477.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/6275552939.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451074e2811---51714886222.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/28ffacab262eaa164542c7a2a8901ed0/40910307277.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/14894473577.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/mozofuluxigile.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/74145941402.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/16675698214.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/68988844770.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/fikabinojogalivuko.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefd3cc855---xoxuxek.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/93727824179.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/juxeze.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109152034283220.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/33239834475.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/banoromi.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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 17936 bytes
SHA-256: 06838a25ea70bc75e7f2c47e32bc163f6e02a17e2f95a706fcba5df1fe453700
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 10668 bytes
SHA-256: fa40350765e583a86957dd697fc53f031858bc8289445d957f86acd6b49ccf72

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