Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5e236f4a847ecc…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 00:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c92d37bab8cf72ca983695595a2a031 SHA-1: d18fd1c218c2b601873965ec4ea572c5b75528f4 SHA-256: fe5e236f4a847ecc6b2456bfcab5eb14fb5cfe65d32178d8d4e6c7ddd33ca65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://ucokampen.com/media/files/3515804937.pdf In PDF document text
    • http://futimisdev.com/userfiles/file/85806194594.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/fizalujipezezowegarepafal.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/guvutakil.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d8e57632103720922cb132720ef8e245/32610092336.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/funebopifutovawinejezan.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/gexubabonozurek.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/656230010.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/dudebawezi.pdfIn PDF document text
    • https://educhina.mn/editor/files/dejewutef.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/pibaxunirilanemoxoxaj.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/82688687364.pdfIn PDF document text
    • http://scantech3d.com/files/xasuje.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/viwenukojilosonovegojaraw.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/196c14b2f59a299783058cdeda0372ba/48507650349.pdfIn PDF document text
    • http://tochalco.com/uploads/files/baduzasimafosoje.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/20469333653.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/baxejubukadexesokeru.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/fijatizesobakofiki.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/75249476965.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/14922896412.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0654c052e64500048b6b6a62f4864eb0/83206321304.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a35166c76---97094218347.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/vapexugipobevexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=putlocker+judas+and+the+black+messiahPDF 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_off0000b115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB115 15716 bytes
SHA-256: 85e54b717316c72a286cc5126883f7320e6455de6268bf22c774bf5af69224ea
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 11100 bytes
SHA-256: 45d7a9126ea0f73d9ec6d7971d8f167f5a1758d6ea55997e111c444a745c1a28

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