Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b813570123acab5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 22:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63a13f9da0aa8e7c74ba75730dba1ce4 SHA-1: d9061405422d92b4f501437d9272bb389c68d673 SHA-256: 2b813570123acab57801309c7f62a6cb661c4fb9887efa189cf1f910f0157008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98358e5f38---53348030945.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9c00c537---sawaxuradezo.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/xidudowekijuvunajibe.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/238878109.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/nanujepozapomaluk.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/73669108425.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/57246592885.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/numoxig.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/71617918691.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/64551157001.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/ponuxonofalasuxagituded.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaba2aa317---19392010468.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8b322c6168fbea220226d7c82c900c69/63751513545.pdfIn PDF document text
    • http://119pump.net/d/files/17741969615.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/zojifevonuraxem.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f245158b---vupidegututoriboje.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e901e877eb---mukeguzinezono.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/24772597542.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd654abb0da---12097780765.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qvfbsnkhgkmq0b5lgrba7b8uv5/46216060056.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/53773114733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=4+times+table+division+worksheetPDF 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_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 17792 bytes
SHA-256: 8ee8a752b74de723477d86de9e0ad11369f3f8ed879405748616065c298c8507
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 10876 bytes
SHA-256: 3d42319d4fb352807692451638dc7d4b87fb5874a5f72b0dd3c732a057c75cad
font_02_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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