Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b7f84947e45210…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 18:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4890b7b2cdb9fe4c6aa9210ea1495e9a SHA-1: 06e502c50ff2ff2276dcac54cc91a98cb8e8f5c5 SHA-256: 36b7f84947e4521053f5314bdf29eb3af7273d9c86b9f1dc10ea0dfb3c7682d6
124 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', further supporting its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and the ClamAV detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4864

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://edituj.cz/res/file/95228168033.pdf In PDF document text
    • http://innotec-industrie.be/userfiles/file/1360467306.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62716470915.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16143e58798c2e---76207284680.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/38994196990.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/64757102320.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/46009112008.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/16059290080.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/vetujev.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pb6l2pfcani4cclb0437338l5n/10468964250.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/3993187440.pdfIn PDF document text
    • http://balalajka.nu/media/mabasoxoxevaxebiwelovifug.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/5396631439.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/46538365522.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0e52d908489005eca49a1c0de6a2ad20/zegunagogenabodivap.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/bewogaguxoxomolanizov.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109110014381722.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4c5362689373e0472faf792dd5e2f9f1/kojeziroromotolifesizuja.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cef5b16e9---lavawagekewapoxibotaj.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/6161093974.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313cd1b7d94---1576629806.pdfIn PDF document text
    • https://olterus.net/contents/files/gojoxukegesurimomogulad.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc670069a---sididu.pdfIn PDF document text
    • http://pbpharm.com/upload/files/tojexasofep.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/1186629133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=words+that+start+with+o+for+kindergartenPDF 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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 10756 bytes
SHA-256: 1f5a465838cc46cfbb20cf528440a8e7d7d81c0bbab9dc2bb9029bdbf4fa80e0
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 18968 bytes
SHA-256: 2571642fa388829aad638bc9946e99bfe6f8f4d42139269eaef127cea45301e4
font_02_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1