Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae99b8666ae2630…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 10:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0238b801038337c7f3c5f15ae5428100 SHA-1: fec4cff966bdb55072d542275f0249e92c35221c SHA-256: fae99b8666ae2630cc02191a35f5a0e7079cf58d3fe8076dd044f4698513e4e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4452ff923c134d9e381effca55aa5f35/zafumaxelesegalirebelizet.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c481afd82---jexuvew.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/39573546411.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/14327433148.pdfIn PDF document text
    • https://digireg.pl/upload/9802904441.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-24/20210624075707716863.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/kekedit.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/ranegurugugejumibisadobo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30d30e8fa---96325858182.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8b47bfc1682bc38ba60847ec07b29bec/guzonusa.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7a1087c90---66650521613.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160848ed12e6d4---xodotexebapurobuguzopoxaw.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/g2kpnt5f4jprvgqsnd86ap7lpi/fuzip.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/88753934045.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/wilogize.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/riteb.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/tosasukozexateba.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/20610169563.pdfIn PDF document text
    • https://123natura.com/stockages/files/57758535858.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4ef22de819881738109fb39ad0863a5f/82471473537.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b089cd6fd2---pekizazarabugitonegab.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceae056958---bukiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tata+sky+channel+number+list+pdf+2018PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 11676 bytes
SHA-256: 8a0564d4b1a48046a4d16e2f320fc18fa7dcc2d12529dc3382c2d8dff5ae1374
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 17228 bytes
SHA-256: cba35d23bce60f05175d862d7b4efbee21c0ce31b0aca24e265f34d6c01481ab
font_02_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1