Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9cd92cb631fd27…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bea91b18aec1170afa611a6e4249f99 SHA-1: f3122e446ee9605c75f0e79835e2625c4b51dd9c SHA-256: bc9cd92cb631fd2790e09af8b1a5c14bff13929220b33d5aa22259e25e9372ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites and disposable hosting, masquerading as a PDF to Word converter. The presence of multiple PDF link farm heuristics and a high ML score strongly indicate malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://bacninhonline.com/webroot/img/files/83111980883.pdf In PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/14f6dadf91bf5692a4b5440c37066ffc/dewagokipik.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/pegajevusebe.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/35457918099.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/vaxuvoxajigexugedovi.pdfIn PDF document text
    • http://modero.vn/upload/files/tanabidel.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/gatar.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/16314927525.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/7787f9128a4cd6fb14eef85820242261/46764101056.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/458dbde856eb230662e52e592bc36927/wepavalafizomadaniraselil.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/jemijagewupopuwuweviful.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945d0e9e634---83421045092.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/13660777064.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/zexajeziwo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ib5rhts4kc18i3pg3mv86tem89/49220395422.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/57407249727.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30db31878---sugosaxotulezu.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/lobowoxezuwajerude.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe58cc6c01---4401356506.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/338ff8a1cc0806706528e56c82d1aea8/3062196314.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/zonamijazux.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/86580897774.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/dezixovoraponawufiwex.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73c828f31---75725791511.pdfIn PDF document text
    • http://rld-carbon.ru/file/64999678166.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ff3c1ab1---78084034927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adobe+acrobat+convert+pdf+to+word+free+downloadPDF 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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 10624 bytes
SHA-256: 45249b41983ff97397b38b64c543f0937000ea00cf9c2ae7c9f61bb663932f8d
font_02_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 17468 bytes
SHA-256: 711716602bbbf4e85fa0ba9936c91dd8bc895c7d0acaab460636593730790209

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