Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3288ac961e97de5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 13:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 183247d7f648f05c840ab446f0fc5b1c SHA-1: 7c6625a5f8e5995b05eaab6e89b93b127e2886ac SHA-256: c3288ac961e97de56892f95b76d6a4251ff42be5f18cf459fc65d4d66f63ea05
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS upload directories or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://salman-is.com/userfiles/file/lulolukugopibave.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161422ce7e4609---95452911412.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45378907.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf19d3848---neludugetovadurebu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/48bc6e71c7f95838c15cfe31e29a2628/kibixura.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/52523361479.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138814ee2ad1---tezajowasojajamuwaki.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/2124337057.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af208cff8844f1f518225c18f75eecc8/xurazosufetatubaposemev.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/zepebenisima.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c3dd7ef7---naforitojiputo.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xutazamixej.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/sekomakekijujesizafij.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/67673571944.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fe53736b---42022994822.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/nonovowe.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/fopezufixem.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/tanemavatarivilizeximiv.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/30074936928.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/naxulajufanojoxudom.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/59258734528.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/68799403363.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/28016329791.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/delogesevesunazej.pdfIn PDF document text
    • http://orthodoxnews.us/file/35056579710.pdfIn PDF document text
    • https://faceless.me/userfiles/files/xojupodelukiwuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+amazing+spider+man+full+movie+123moviesPDF 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 18280 bytes
SHA-256: eabb56a024707bb74693eaea82d9a166aaaf793fcc972ac5ce89d855c21d101d
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 11380 bytes
SHA-256: 44d12edafcf5c4fb207120221e70b500100d506509dcfc7fab89a12f0c8f0bcc

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