Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2de860fed33ce90…

MALICIOUS

PDF

73.3 KB Created: 2021-08-08 17:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d34b4e49ae7969037bf07e06b26c5341 SHA-1: b67fe26434e2b884f50fd3aa67aadaa4328321bd SHA-256: a2de860fed33ce903b71d29296a72e1fc96292d4e5f9c8605df6cea02dbfbc07
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6162

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=advanced+english+grammar+class+8+pdf+download PDF link annotation
    • http://cgl.lu/userfiles/files/94187113349.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a14fc0252bcde4e7042ad781b31b99ff/xilugopofoferadusovagi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nojose.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/13399325.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01af81d10---fidanazujurudirixan.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d94a58dc---54157410443.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387483ae7b---38091568160.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/38264629637.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607510ac037b1---49130857483.pdfIn PDF document text
    • http://djapm.com/userfiles/file/19538220782.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9d056d44f854775a1c8641299f321359/29646620177.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58279f00b---pekerofodesajari.pdfIn PDF document text
    • http://bestcoloringpages.com/userfiles/file/tosagipuxew.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/dibalemoromirabela.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/tumadizupamemozi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c5323340---depazobawisezum.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9bf265ae---65825525464.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/60704894702.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/094d0b26039692d5e71f6913921ad2ae/97343355948.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b302136e85daea72f494e5ba039fa564/67440315988.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/torimukovutewutafexutelel.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e3278cc1---79950858577.pdfIn PDF document text
    • 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_off0000cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 11308 bytes
SHA-256: 985f3e0f9c3bb6bade4bdbd89394a0b2fbf15dff09d51f3d359e30e48daf0bae
font_02_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 17224 bytes
SHA-256: 7c056e28719019d9bb1c6a4d526d8a66caa7b44cdb4407f6228b88bfe01c3966