Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f16930ffd34f52…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 01:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25e0acf4c41ea6774f11392fa222127b SHA-1: 0aa575e9d362612dc2323fcaf636a5e4bcb651a2 SHA-256: 84f16930ffd34f52d3ae872c3b9be281c15e0942a8bd6d41eaa30afb4268cb60
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a payload via these links. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9815

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 https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a801340962a---navupena.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/43189396246.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f55ebe049d---28385841754.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9b7857b75a7a46605ad091ed6009c059/wobadijuku.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/c9t5p3e6mkhdd47fcch3fdi2p1/77638997397.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608694ea10cf3---foliketibisubupezowunaz.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kikitofofezakebap.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbc1868c5fe00a15a0dcab5bfa49d9d1/kafomow.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd873c5cd0---75287535394.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/ramipupatiranagepuxufudam.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210608045955.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160f19d3f72250---39968911009.pdfIn PDF document text
    • http://abwva.com/uploads/files/wejerupopapefafad.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/mewexuwojedatokef.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/19377975775.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c600ab3ff641c2fac210e1cb8dba3234/30792657210.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/gogunaziwujowajibamivu.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/dasajezavasavikipegarim.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b8709ea7e4ce51dbb013e8f9ed051d58/18346744390.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efe425d63---gikatew.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/73370017974.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ni183om0fue2mp966eb37oege2/rujaxizaruxukejodegaxi.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/guwepo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0396fd896d---befebexoxafexarezixiruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=protax+financial+servicesPDF 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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 10500 bytes
SHA-256: 03b9bf991b2845f0153ee6e30df38683cec48dce5c309c2ef7ffd54921c39919
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 17944 bytes
SHA-256: a2c8d22622aeb3e272c9da487a895cc20a61d976f5c1721359593c0ffafc6062
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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