Malicious PDF — malware analysis report

Static analysis result for SHA-256 919864cf245e0b9e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 19:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03070b70e3a4978c6ea79441d443367c SHA-1: 74e2386f8872cfc714d31d56153521102521481c SHA-256: 919864cf245e0b9e401c99e74f07b598604e474b4f09d5e6f56e4790df828182
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF contains embedded JavaScript and multiple external links, some pointing to compromised websites, suggesting it's designed to deliver a payload. The heuristic 'SE_SECURITY_BYPASS' indicates the document instructs the user to disable antivirus, a common tactic in phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://brbud.pl/userfiles/file/wewufafatazi.pdf In PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/befawonawetaga.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wipizobeje.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/98504341315.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kavafikemadux.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ca6ce65391768828090b8b277b093e54/58881243751.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/kukoxawijefapi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/55567174999.pdfIn PDF document text
    • http://sswjeans.com/files/bitijifimajamepodesaxi.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/xutik.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/didaxu.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/rogixu.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/gutagowab.pdfIn PDF document text
    • https://carlojans.com/cms/file/rupovulajirejiz.pdfIn PDF document text
    • https://foulardfotografando.it/file/84589828448.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/1400406023.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/19562659766.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/labitufemivexufumej.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f5ca4798c7be94bbdf892a78a760a4a/dazesigof.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907033523.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/pobajekejijakowiwufaf.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142422a1409d---73670307306.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451fcbdc2e8---bitev.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/mupizunizugibaju.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/vepedajepet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+fingerprint+lock+in+any+android+phonePDF 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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 17536 bytes
SHA-256: 13cd1236cb4e02d16fb8897fe03898d2e2252d2c670cd657e20ed685dc8d4941
font_01_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 11180 bytes
SHA-256: a05d152f25a029eb62a58a38c0c88ccf2fa5adce819beeb65e289de9cca27df3

Open this report in the interactive analyzer, or submit your own file for analysis.