Malicious PDF — malware analysis report

Static analysis result for SHA-256 531b416a5a670ad2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 15:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6465d103c640a8c013392878e0d610f1 SHA-1: 02a15bef522c066d3da352a833cc5813568adfe1 SHA-256: 531b416a5a670ad28397c5400e07e7984592fb372b8e3a7ca0bf3846a0ec2b84
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many pointing to compromised CMS uploads, suggest a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9039dbe7f---diweda.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/renukizux.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162940198852227179427.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b075c7fe28---13344808119.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zavegaruseruwutewikogevu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hrau7fjgfou54t59mum10eckr7/foziravafiw.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/410a11c6a29f263abc7558f72bc6153b/20827770581.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68a37e70f---86185915746.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92027216024.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/68942808207.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/27881243472.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf213eb3e7---27405872741.pdfIn PDF document text
    • http://weingut-suppan.at/files/rarokewekivexiweropiz.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/kedavanijig.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/nokavatalesekof.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1623914357664502580.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cffb4a134cd615f4f804c237a5d4a0f7/pilazeparijoroduga.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a2dd7339606d69ad50dc3e49c6a1b26d/32256640281.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8e41696cafab34e5213d1ab5e10fca75/88286753071.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97411d8a4---57069988672.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/xokejij.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mf6ncku4igjfju9mde1ktjq3o2/sojukugigemelalom.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/lekazirisuniwovimefowedo.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/59271240038.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/97900511437.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9dknbuj7h283aqrvju7hr70pth/75974381731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mmpi+2+test+questions+answersPDF 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_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 10812 bytes
SHA-256: 6515a10eb9694d8aa37e10353a14f8aac7652eeca8b2d7c747a82ad05ae5c06c
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 19628 bytes
SHA-256: 7f9a6221923fb11362bdd3502b72d731cb8843e5a494422618a35ceb78064f13

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