Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91c2012a93284a7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 05:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 120aac7f6f71f4f8078170763babe444 SHA-1: 1c6947433bc85c0c2b360b5e59f616e5c1ba1679 SHA-256: d91c2012a93284a7831f54e18387b87021191c02b3a9c165a42e5dd510f13a71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document is designed to trick users into installing malicious browser extensions or updates. The presence of numerous external URLs, many hosted on compromised CMS platforms or disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=what+channel+is+boxing+on+today PDF link annotation
    • https://akilanews.com/ckfinder/userfiles/files/48361163127.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/77293854284.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kufaxawugomijezavof.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/20720208842.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/88481296600.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145223fb6be6---takid.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/zexuwizazeroli.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nln8flpv1993bc1q9c9iii38d7/36134147134.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/81589995742.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/jesaxobumurezajupod.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/vepanojuworonotivudevoru.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54640710007.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d006b95f8---76203163606.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/vanebinasoravuwit.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/87792236416.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/5036723355.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xavasasuvusafudojuzux.pdfIn PDF document text
    • http://cartopack.com/Images/file/68432925697.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/ruxifafipiginaxoxuzowo.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/tubokezesepitogodajima.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/zetew.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wetabobefo.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/90266913526.pdfIn PDF document text
    • https://totounited.com/contents/files/vitusapomafolemibirajefag.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/52265298873.pdfIn PDF document text
    • 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 18252 bytes
SHA-256: eb3453fc2e5591f7e3f29289d25a992a5494b0765cd4e05d5f8493a23aff5212
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 10900 bytes
SHA-256: 0d055ea9c332464644b10982fd5087b40fcfaab1e25afc2e4f9267cb2d62f8d7

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