Malicious PDF — malware analysis report

Static analysis result for SHA-256 71daf0a6931f92f4…

MALICIOUS

PDF

72.1 KB Created: 2021-07-25 07:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 71e0260860f14a4a0de09e2f03cdb6f9 SHA-1: 9fd52fc8a700a617434ecf785e601b166b5731fa SHA-256: 71daf0a6931f92f4ea97645255e598a03d09f08667781bcf0a8460db1564aeec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9414

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 https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d35bd079f36516eee0c1caed72d51b1a/36100640742.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee1c017103b41b1aa1284c0674db48f6/17192131766.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607954bc85e3b---10018334340.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ced561e2820ca98f39826568fb6ded64/toxadugefaterisazawerej.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/vukalixubuvuxekolupabi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/66d17bc523120e994a075fc3512fb557/ronemekakop.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/11507933546.pdfIn PDF document text
    • https://luminex.pl/upload/file/doxupegozu.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/44493554747.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2b332ae9967e621d4d1c141a5d6e890d/memawerutaka.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/pubidixewek.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37a378614---42470512512.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f9d12592aca409eec96a29c3776fba32/fexut.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80ed4dfcd---19520390446.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/51830332912.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/586d33a70555542c1461125120780b34/raziranomegodadakekeb.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1a396ae60b3d9d0ad06fff5f07292a2a/47844184699.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/kinugefukiwirafi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02e7c5ea3---wusuwuzumadawa.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce3ff05cb---sojemogida.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021072208252747.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6f0c21f5cffa6649edad337851b87b84/63014182076.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/265fc1d504f31c7135290710ecfadc7b/99279309693.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/499d2e7712f70eafec737ee2e93255c3/80581551657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=simple+offense+vs+1-3-1+zonePDF 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_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10616 bytes
SHA-256: 5423569b3c149ccb05649144e2178bd32d576d2c9f69b5c6ea0c634732c2cc33