Malicious PDF — malware analysis report

Static analysis result for SHA-256 138a9b813070686b…

MALICIOUS

PDF

66.2 KB Created: 2021-07-03 01:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4096033f3a74719b30bc06c306be7e2 SHA-1: 2009029b1b0ba2bb80a53e52e337f775f11f507b SHA-256: 138a9b813070686b79a54772a96d05920c74391307cf4322647a188c753044c1
94 Risk Score

Malware Insights

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

This PDF document contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure users to malicious content. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent. The document's structure and the nature of the linked URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • 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://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607909125a0fc---pezijevipajejo.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61c325460---46757921125.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/neduno.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f0a268329a34ae41c5f64a58470dcf76/11885523262.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/e8e011426017d0b66d785e3eb220b3ba/25776930888.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728419950ce---tipodopironiwe.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h3tqagtlkum0rovg39evg61669/26220720901.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/selodirilesuropajek.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/2872702448.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/58896846948.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210612083433.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0445d21379e424edd675c4c555268bdc/mupixosuxobigovefose.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/donodezabi.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/wadapokefurodijokerefibex.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ek1ga1dailtgnugcq3hvtfg06a/7189238943.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/020a4538006763dcda7e0bee761a712f/80088680215.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/47c25ca77e38cdd186e29758b3f5464e/29014763184.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c8edbc8f---27667121361.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c3d946e59---gemagixowodolopukudalelil.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uh3fd2ccqk68bj6vlvq3cas4h0/kefudapigonexesonin.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/72535867978.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef726fd8c---38459209964.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf71c5c7c9---89677651472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=boiling+point+of+water+in+sea+levelPDF 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_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10736 bytes
SHA-256: b5e1e86bd16feeb3cf213f18b8247ebeda8e9d5cfd86952c138dfb7b13a0efe7