Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6226db527276ea…

MALICIOUS

PDF

92.9 KB Created: 2021-09-19 15:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e2521024ac5de7b4f91c3f88aeca9a6 SHA-1: b555fb4b11a45ffd2ae9116cc0af2b391ade2274 SHA-256: 8a6226db527276ea555ac73ab78fd2ebe68528191ac9c648c517f15651197811
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript and numerous external links indicates an attempt to deliver a secondary payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b044955934---1636952334.pdf In PDF document text
    • http://scvumaichiramen.com/uploads/files/4015865739.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rosesitejexopebikadodo.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/pajukevafimadiv.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/fugas.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/tejareg.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zurevogale.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/93435828877.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/14025313375.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/jesokowutobedorewej.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/39886754490.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cbakige6835u8od16fovv3d372/24211734836.pdfIn PDF document text
    • http://parentini.it/userfiles/files/toraposowopulizegim.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3f057f0b---tabafipatodotibudemeduzo.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/93313589300.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/24326042410.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/wagofeko.pdfIn PDF document text
    • https://bawauang.com/contents/files/83031361158.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/30227449239.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465276e0c75---vademorodagojojo.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/93932958489.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd81171a41---nowibixu.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/sojefutubunosupena.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/65667503163.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/14500565678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=robert+ricard+la+conquista+espiritual+de+mexico+pdfPDF 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_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 20268 bytes
SHA-256: da4c0e35dea3b67f5bb79e1ca04ca140fb37b0003008d17a22a55e8006f9329a
font_01_sfnt_off00013fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDC 11312 bytes
SHA-256: eaf0b5a9204ce43f73a371752c5d43d30faaa212260bc0b4cf09d2f8848c83c4
font_02_sfnt_off00015a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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