Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca1d502a0a6a31b…

MALICIOUS

PDF

270.1 KB Created: 2021-08-20 07:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 197ee39e186422492ac14c4d3fc6f459 SHA-1: e6b4dbbb085709cd8dfb8558ac1d244def914eda SHA-256: 4ca1d502a0a6a31b738c0c034f035f620964b468ed7d93d8345082f2c26862ea
126 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage, indicating an attempt to distribute malicious files. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6678

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.
  • 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 http://4998horo.gmmwireless.com/contents/files/wusagekeso.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/1255266133.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/refejizijivorataruz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/213b2e095b3c0ed970cd80fc206e5c2e/kegapila.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/vovanepiwu.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/30569026727.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/raduvemox.pdfIn PDF document text
    • http://www.siposferenc.hu/html/18012720271.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/81423847578.pdfIn PDF document text
    • http://lyshiying.com/d/files/64434873976.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/91456299462.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6d8e97da4dcd4b609a37eeb90b0cef83/tiwilifexe.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7afcdc32a0---43778770844.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/98266269169.pdfIn PDF document text
    • https://melz-feu.ru/upload/21300196134.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/61f0aa54737663b944f39e6dc745d159/jefigogopexurawirefusutow.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sowedinikiga.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lcro5l9ncvu2hi7c41rrgv0956/vepanotijikumavix.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062608424468.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wixivikuj.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eded030d995---97524391529.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/edd7a8aec3230f209961de38695c08c2/98665705705.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/33746638822.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/39832025706.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bc5c73d63aecf22385d4540669c2cd4/23346438119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+pronounce+chinese+lettersPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F47 37296 bytes
SHA-256: 8e3414c621b8ba7323fc5f588c1107d361f0850b6a2182892def33dc067a5742
font_01_sfnt_off000293f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002ac08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC08 10740 bytes
SHA-256: 35728e43028f70e284e3d076caaff4301fdd8f3e4a36d8d5437954d78977176a
font_03_sfnt_off0002c4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4A5 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_04_sfnt_off0002da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA8A 133972 bytes
SHA-256: ad9d80e3f0c7a138a13d17dbd420841c6a93b82b93d63d1525d1bad9a1e3dc0b

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