Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90573d2fba518c4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 14:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 506623c542b678cd107839ea5938e8df SHA-1: 1525a3559586e33aa3eb05cf3ee95949005c1ed7 SHA-256: f90573d2fba518c4c8637679543945ff427fef490221dab05ae61720cd304dd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites hosting PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier also flagged this PDF as malicious, supporting the phishing and potential malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://broadcasthub.com/ci/userfiles/files/4779419585.pdf In PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/54366817815.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/fesukezezifinaliwapuwe.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41b98416d---gutebixokejofenatojili.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedb5ad80f---95564536210.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/28379975645.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/panofeja.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132faef7a18b---kozigakanazelupiv.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed04836bc5---64920308184.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/65336806624.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/2516600693.pdfIn PDF document text
    • http://orderkai.com/uploads/files/55451416004.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/71113657879.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/55173711886.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/pejasobolo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/89014076270.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/50453480439.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/mozesunazexevosaseb.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/koliwudokosaxit.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sefogezujefugosu.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/96997195267.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/8141835929.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/xijawemavekimagebewu.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/devizemuwaxad.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojaxizobowixukopesiteti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+take+off+screen+lock+on+androidPDF 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10636 bytes
SHA-256: d9f076c9130bfb4f19d7e1a3d13fd57915622b54f0661f0743ef8665b15c7dad
font_02_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 16960 bytes
SHA-256: 010dd7bb430eecdba6a45d1764a9a41fabf22428a16680519d4a013c470fd165

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