Malicious PDF — malware analysis report

Static analysis result for SHA-256 37edd1615788c5a9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 15:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d7c74353ab7a4518a1c07b69742367d1 SHA-1: 89fe993bda86c49e9ad0b1c1dc50ea91cd680521 SHA-256: 37edd1615788c5a9e1ad9cfb972abc3c66aa0c8d73eea3e47b37d17ae665aad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised WordPress sites. This suggests the PDF is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6340

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://architects-desk.com/uploadsfile/60674136536.pdf In PDF document text
    • http://www.mostenpo.jp/userfiles/files/wunodivofawefil.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9cc924c0ba71ee928f73fac678b3e068/zonoxofe.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/78014369530.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/zovawiwuve.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/6661980655.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7d3d407a2ce450fde485a57daf1e0b9d/40374227304.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20215308531877.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb63efdfd---71427382843.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f1c5c7cd68a4a556d97e530489fd329a/lubofidaxilekabelevabef.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6a99b5e5ab181532e9f8b22ed4935b50/76478614114.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/1e8af269c64d0039e25cfea0d2b176f1/79436562565.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/tunetakapezefubazasur.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06ece8656---kozizobibivavojokugabit.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/zujoxigebojunot.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/vagabusijefaxeku.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/70250101456.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/bupijaxalutet.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5b64jbcudbq4lgkn3jle55shhl/balisa.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/julin.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e874770f55c---fagozedudijozom.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/22498516221.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f74ceae2---gijesibisidivebebedet.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7umkkl1ivrjvpsqi8355ufrf32/juguvuravobajiwetulexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=neo+mendelism+pdfPDF link annotation
    • 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_off0000bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10276 bytes
SHA-256: fd4e1884b59c584c27afd440f7622c690e07e60b4e2e2548c0143b3c04f3115c
font_02_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 16756 bytes
SHA-256: 01732c6463090633d0e165317252e6dc1350cc3ae78c375ad49e9d00c63d874d

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