Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c54a1d930f8938a…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 00:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f212124f4c1342817a07e7d2447c462 SHA-1: 08127695092f52cf8171cec07f2021bc1a77b627 SHA-256: 4c54a1d930f8938a16d9979dc7a01e46d122a0f67fabfc9fe90e94ecee7bc2bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of these links and the detection signatures indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc85304cd---wejok.pdf
    • http://antifftech.com/uploadfile/file///2021050622123616.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/91574559087.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c0430179---58466504051.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8aed48a0b9bd29a1f85d10bd08f3daac/84626918059.pdf
    • https://dakhoathienhoa.net/images/files/26004398020.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e688a305f7---76743895070.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5af33f5f---vowiposuridi.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608320916527e---dugijefigodumow.pdf
    • https://nenanhduong.vn/Upload/files/sarikowol.pdf
    • http://wittlich-luexem.de/userfiles/file/66458643982.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a939a6d2b0---29829376516.pdf
    • https://aterhesseg.com/up_image/file/42868413732.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85536862325.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/95384581309.pdf
    • http://beamstraffic.ae/amb/userfiles/file/99898405591.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9061d3b4a---buwetibivaxavazotevivur.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2o2s5ai2sd8mc0isur93mn4524/67790313788.pdf
    • https://widepolymers.com/userfiles/file/ginopekunasuxajoguximuvef.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/12114160661.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/34457bc5dba41ecedb6a202c4ae71b06/23943799629.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9cc500a3---8719049676.pdf
    • http://allprintusa.com/admin/images/file/rodukufosibomaruxifogib.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8640dfa76---6540379294.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+word+converter+online+free+no+email
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38a.bin
05221501dcc8d3c2514cd6e93e37acfc9d21819cb774403ebd36263c5a4ef44d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 17356 bytes
font_01_sfnt_off00012101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
font_02_sfnt_off00013918.bin
c0fabaf6e6eb4d0686692b347b2dbc26dad623e75bfdf8dd420ea1f9b162c9e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 10620 bytes