Malicious PDF — malware analysis report

Static analysis result for SHA-256 f253a354361398f1…

MALICIOUS

PDF

89.9 KB Created: 2021-09-20 22:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 531ad415ebaef755f17ae9fc919ea8a8 SHA-1: 227b32fddc69d9dc1170d85c902d97d403561985 SHA-256: f253a354361398f1ad2a55efd3b3db413413778a5a4562da625734a98d7ff7d1
196 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update, which is a common method for distributing malware or stealing credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs, including those hosted on compromised CMS uploads and disposable domains, suggests a phishing or credential harvesting operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://inwebjor.ru/uplcv?utm_term=android+games+in+pc+version PDF link annotation
    • http://e-skala.pl/userfiles/file/komotefekonimixapolinapu.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/69626468005.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/82287998192.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/ketubo.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/gegazotepubelemota.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/68191907709.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/73846074498.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/23830326810.pdfIn PDF document text
    • http://nature-revive.org/files/file/98356891650.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/rofakolunudekejikuti.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614062deaf801---66339308643.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed2a089d1---97230339635.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf006f0d---disuliwefelup.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/gugaket.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/pazemikoledenosuserip.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/24211122785.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/ponowaperagizofoxaz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458a724e245---27529850438.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/durona.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/67329138313.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/figaxudusugup.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378725b2fbc---fusivuxu.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/bilejudedawugiwol.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/fenebinune.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_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 18376 bytes
SHA-256: 7fbd2e5403ee7c68cbfa43f7ce64f011d6e95916d36e474026edce718cb89ccd
font_02_sfnt_off0001412b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412B 10760 bytes
SHA-256: c433775b409a89a848a36506aae37a392faea940396574715cb341252381077d

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