Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65c4bd53b757e05…

MALICIOUS

PDF

95.7 KB Created: 2021-09-20 07:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c2e72a96b9371e35bc4e359a1470c9a5 SHA-1: 80f277e5e94559e758c428c57d81b4a8ef14d578 SHA-256: b65c4bd53b757e0536ee8ee6704b84a266c186896fea3e8b8942397a4720570b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3262

Heuristics 5

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=play+free+action+movies PDF link annotation
    • http://jikaramen.com/uploads/files/wifexovalep.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/pulobike.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/11717805023.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109170551352163.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sijugenut.pdfIn PDF document text
    • http://webursitet.org/Files/file/wemuxujemefeturanugugajox.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/1402456154.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/8502528080.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109200103144674.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/72081598292.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d955f1d86f.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109070945156694.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mufaju.pdfIn PDF document text
    • http://armanetti.com/images/vebumezapixelarubo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161389d36de325---88055939456.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/12354960208.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134233c897cc---31346547987.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/70685545349.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/verejolupajumaxegevokujun.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/72200007994.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/15857225316.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/93779470894.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/15447767269.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351931d291b---58049402791.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/41561545085.pdfIn 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_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 10676 bytes
SHA-256: 4ef0f3d052d037806a0611afa2bab5a102cc81e80432e81f56a8a876c31aab94
font_01_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 19388 bytes
SHA-256: 6cd6a3f88bec88f091154ce0324c526862609d9ff63e79a33f9accefcb0af3ee
font_02_sfnt_off0001686c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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