Malicious PDF — malware analysis report

Static analysis result for SHA-256 35946a0b5135803d…

MALICIOUS

PDF

91.9 KB Created: 2021-07-27 15:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42d7b76e8bed5ab6ffb7d7bfdc740369 SHA-1: 1ac38d3c2a4c37913fd20c5be601cef8386b4ef2 SHA-256: 35946a0b5135803d5b033bd47830637379635c1d0cb2b22e7f08a3c0e07f7a3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. This pattern is often used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xaziwemejanilabiket.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ede7a6e476d1a93208634c43b759c3a8/rigut.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/31357873426.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///72690930397.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vaxedilugovefekizo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5d5480727d489b8855425c7e9283b7d3/nivez.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/1667186986.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/50bcbefcbc83019a95040dad2ded5a4e/75365729893.pdfIn PDF document text
    • http://changdahk.com/upload/79159158179.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/gevigadepivesogunar.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/zonofazuf.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/dufaruj.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97721aa07---wurobefovadejenagenu.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/waxexebov.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cpu4ad8c694hlnqp8kfpndh69n/48834005668.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210602/file/16226086488313.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6399af6b48292ac20bbecc23068e104a/90497133403.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/15454438932.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/76581189884.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb5482b7fc12f556a53e6487d29aee0b/monelojew.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ipn68hlg8qd2t88rfk5bg6u8lb/riditob.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b07b038184f---weditawaritelax.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae554d7fd---43682906903.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/malusuxosuxedawag.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e34243b17---tolujazodoji.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/jezezuledoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=counting+nickels+and+pennies+worksheets+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 11208 bytes
SHA-256: 007ea955fe277a788b1fb557830c73bc2ea525a53b4b17b9ef4c813f08036b36
font_01_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 17708 bytes
SHA-256: d6f35d4a954f102bbbba12d594701267fdf61e9ef39521b4cb34267ae2c6fc04
font_02_sfnt_off00014959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1