Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19dfc56b4564cf7…

MALICIOUS

PDF

69.2 KB Created: 2021-08-16 07:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30c9e03e68b0be1a6c02e59f10088842 SHA-1: 64c570c512f0569e51b0dc398900b5388d09766d SHA-256: e19dfc56b4564cf744f8793565dee39b13230eeb505c9ea5485c14f7d74cc6df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7138

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.
  • 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
  • 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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5466d0af3e---58789604666.pdf In PDF document text
    • http://nc-israel.ru/upload/files/36686314528.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/274946f7e07b27387651f062cd97408d/lafelimopotosokabukozo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/61741562129.pdfIn PDF document text
    • http://liyangah.com/Upload/file/49684776534.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/62554129779.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/giwulupaz.pdfIn PDF document text
    • http://www.siposferenc.hu/html/logizuwigukimexoroxetad.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xutofeb.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c3e62ee---sifimutixotiwadoxaz.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/77358348324.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/41628658250.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4aaf96613dbd18c7ea7dc800166d46c1/tuxepalegunesobiweli.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/24b033156e2f26440ff77c4ef370b135/nejejijujoresug.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c9e63b8fc8cfec1dfe789c86ccd8dba2/bipif.pdfIn PDF document text
    • http://webbuilders.com/files/file/65610156494.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/mokosekazitox.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609954e51b261---sinosufikuvigasomoroget.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s3d6q00b1ncl5aa1gl84jkd9pu/zepovoroti.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97702d2eef---pevupuwosowejojawepokumew.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/94d739bb81d1e9fe45eaabf318f3f8e0/26894025216.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/66547087186.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c46c9e6---42074882003.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/28714456275.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094723b182f0---zogutozunuriwiwidoz.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/228d46894841725b27cca96cd93c77a9/13575540611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+do+transcendental+meditation+without+payingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1