Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2b8b671e5d92f3…

MALICIOUS

PDF

64.6 KB Created: 2021-06-13 15:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 11b6872328214a93cda12a3a518501ca SHA-1: 8f1fc10400022c3b2ddab3297e2edde37d11b1e0 SHA-256: ed2b8b671e5d92f32f840c943784902b79655cb79a443e957f41b840e2e489eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9514

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://laborke.ru/uplcv?utm_term=viva+la+vida+cello PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/stdva05nujn82rs0d3o7j7q3kn/13145155542.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/44191175325.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7rhp2s5behm83i11o0sts0darg/buwomowabajiganeg.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093f826ed061---fupofujixutos.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/558ecdc9445460858019965fd203aecd/tukin.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/letuzozofuvun.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5504d9fa---fubuketufivomuwag.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/gbo4uokohari7l2njk0f3vdsi1/jafudutozimoriwuwexunot.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd45a0433---87172839020.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf2442133---fijerawomin.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/50238512899.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb97738d5---zoxonex.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a68276a7bc44bd4597327be69b3c8296/powagewev.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2985472d1a0ed54e9eccacdd83818104/kerufosabaserogiba.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/65929352583.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ir9j16dcc74h71lr06ttnbpirc/49558284454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 4684 bytes
SHA-256: ee082d2fe1cfd798abe358e4546dcb933eb97673622c9a3b100e9f5b902d554c
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 2524 bytes
SHA-256: d7c5e4235d45fdde627a74609658cf6d30bdaa79d5df26c9a70051363b7bc678

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