Malicious PDF — malware analysis report

Static analysis result for SHA-256 7307b1ff52910314…

MALICIOUS

PDF

85.9 KB Created: 2021-08-03 11:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5330f335ec9048612eca123280a7f626 SHA-1: a30b9554a72b7b366c96933b85d01b758e452cf4 SHA-256: 7307b1ff529103144b0a09a421021742d4bfa79e3cc5cd2a75605f76b83322e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or further stages of infection. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9500

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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac704022cb---55978896154.pdf In PDF document text
    • https://xuanhongkhang.com/upload/files/dazazajos.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/rarawiledepejode.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/tovitidifos.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/bopidepesezamesibubese.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/90bb1940876e24f5803f44928eb7889b/71941126471.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///nomunibaluwed.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763914c3d3d---danimikinikob.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c717c1dd1---wisezisekimezede.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0mrbuoiuv2remf88fqdsfr2fu0/75871514776.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7ebf07d3408ca13551cdc67f7c5329b2/radopaluvopebopodiz.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/81744547211.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3bca390e4---52297966792.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ea5871d7---18680937123.pdfIn PDF document text
    • https://digireg.pl/upload/kiradane.pdfIn PDF document text
    • https://promise-land.com/upload/file/betagukumapitivotikusidof.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/76411750026454df981fa8444c977322/8591814385.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5a8de3f22e82df4707d99beaa88d4ba8/fozatubugot.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/pabuvirasemitetezano.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adaeb860a27---34618916733.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dn2he7o4tusu99rtg2806toa9e/68678260171.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/40807705390.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c528083e107---8312220430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fisiologia+do+aparelho+respirat%C3%B3rio+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_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 19496 bytes
SHA-256: 481fdf618b99fa4b69a91cb7c19446f76d70acae5eb9823aeb6f1aa2db066068
font_01_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 10788 bytes
SHA-256: 28400d9619d3931626034c0ba8f6765dcf10e6a07fd16f8e3b2046871094bec9
font_02_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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