Malicious PDF — malware analysis report

Static analysis result for SHA-256 9260a0de677618e7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 04:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46e9c2039cf629d70c5fb801a71043cb SHA-1: 6b5b02356efe73f1dac16b944fc490b1589b02b3 SHA-256: 9260a0de677618e7617e02d3551bab4ea3615f5426f63ed3e1e326938a6abce5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various URLs, some of which are hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://tecnibat.net/uploads/archivos/xitagavex.pdf In PDF document text
    • https://ghnservizi.com/file/majosidizijiv.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b0f2a246ce70305c97ec3c1af75cb2cb/kobinakigatosopi.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/tateziveradusopasisufizez.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/prt8mr5ilaq9rc464g0106rk58/4365726368.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/33745392414.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/bimumafapozuvujafamu.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/43570280175.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/39010821081.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c00a645b2f---bifititutirusujoramenef.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/60320797442.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ea2258dc---nikugube.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/583a5f1d1cb938774bd8c185338dd3a5/52936361501.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb14cab78e---52824683005.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/nedikedalunufutudoz.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/nogufex.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gejatunirasidot.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7330ce956---7584164369.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/lesumanewaw.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fea91c557eb55d4b6ff59af71be8f264/lidibep.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/53932173323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=adulate+in+a+sentencePDF 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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 18600 bytes
SHA-256: 8bd07410900d1c4eba066a7c329eef43005f0f6789bee9b8bd57b5d3b3da8aa6
font_01_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10224 bytes
SHA-256: 22c0c3acf9a563fdbd655cc0693675c7bf7746533dd5f11ac8e72aad85254fb1
font_02_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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