Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a787ebfd296c54…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7f603ab7143d94c7c210c3c685f02930 SHA-1: e6cfe8ab995a8d7492a843a00c842c132b013bc4 SHA-256: d5a787ebfd296c54ab39bfa793b444658f1bcea6dff730defd37fe4ff4babab3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ashokarefrigeration.com/userfiles/file/jasofelijigevigak.pdf In PDF document text
    • http://e68momo.com/shopadmin/upload/files/41283300496.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/29048274851.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134892f1ecbd---pigujezi.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/h5t7t8ibrfttj0oga2vdqgsom3/zasuxulalenavubi.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/lagawikoxisutivopojisaset.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/jifotoxozanoxusobasorivuk.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/zavumejoxolano.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/81363507954.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/babadex.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/tenufubiketonap.pdfIn PDF document text
    • http://castel.lu/userfiles/files/33661631962.pdfIn PDF document text
    • http://cssh.es/img/file/43316261096.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/7513973162.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/25527083971.pdfIn PDF document text
    • http://surausa.com/uploads/files/pixojivuguxo.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/91487769036.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5cc0b6e7.pdfIn PDF document text
    • http://njchemland.com/upload/files/33832290498.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/54346916811.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/jezigufapunone.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xudabazunodaditugobi.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lagizasilajoto.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/81985895107.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/58686754772.pdfIn PDF document text
    • http://www.moyekolodin.com/files/93528948151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=es+explorer+file+managerPDF 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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 10688 bytes
SHA-256: 837af46419f9c80bee101a05fba4f7b98185991fc8a04f0baa25f5736d4ebf80
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 18284 bytes
SHA-256: 4823da66eb6bea1be694eadf07498bea66bb0a3acae24cb7dedd442f7a55d8cc
font_02_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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