Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ef23c7b48f26be…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 05:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8504014a9eb1362fd575bbff9dc03e58 SHA-1: 32723e9bd4a71a0ed5dcdad403f659c02ab782e2 SHA-256: c7ef23c7b48f26be4608579249999113dbec7bb13b8dd91f294aaaa8fb342154
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=family+chords+of+a+major PDF link annotation
    • https://vyrukrc.lt/userfiles/file/rasexosik.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/81414161704.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/81957057665.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/34951982a064abc492c908157c160358/lutogudopakijuxifufukubu.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/59807110985.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/miregonijiwurebumaza.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/nipodopaviwed.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/luluxelajupumoluseb.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/85496522733.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/36493257101.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kurakupubufopuv.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zogelojulu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142e96cacdef---rovafawijawuduzutaxov.pdfIn PDF document text
    • http://cftckr.marketsearching.com/upload/files/4268378659.pdfIn PDF document text
    • http://pactolous.hu/upload/file/52807974084.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/bisisiponal.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/lilosil.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/94262433541.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/jinuxijopimomefijemupet.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e83996312---luninizofakuxodaf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8r8m95rfahi4rr9q71mg7v7oj5/kirozurowusixujurawin.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/buvutij.pdfIn PDF document text
    • 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 17124 bytes
SHA-256: e1ebe9fa78403dbd4ac64cd82671ec40b4a113a2c96747cb2f9f33f53eee4b40
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 10628 bytes
SHA-256: cb541e778f5a309a1bceba7f9ef5d1dd66bf4b23ae89af82101494656e39f80d