Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3424134e90a6cb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 16:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ca164bc34a8c4ab4ac6c61f1d8dc072 SHA-1: a8eefd77e3bae52d477283e78aaf502b7abb8e53 SHA-256: 7f3424134e90a6cb04aea0641061d696c2427f0c685b9b991bfece8a28cc563f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised CMS upload storage, likely intended to host a password-protected archive as suggested by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. The embedded URLs and the overall structure indicate an attempt to trick users into downloading a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406d896f035---96088331018.pdf
    • http://aweibel.com/Photo/file/loxepoperidi.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/fmig9o2p58ko35aob5c9lg2nc0/62509715533.pdf
    • http://baovekhucongnghiep.com/upload/files/90669718167.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344cc8b1547---kifabazifobakomopowomolu.pdf
    • https://linkevicius.com/upload/galery/file/84653396136.pdf
    • http://akcjonariusz.com/UserFiles/file/62548778000.pdf
    • http://usateatop.com/_upload/files/71742984228.pdf
    • https://dennismaloney.ca/upload/editor/file/93986245511.pdf
    • http://air-con.ru/upload/files/37653407886.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/6053536655.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/muwuvaragipew.pdf
    • http://constantcontinuity.com/membership/data/files/53170806843.pdf
    • http://vidol.eu/userfiles/file/fukebuxegoriwogati.pdf
    • http://tajesink.com/Uploadfiles/files/migokifovaderegoxuladeg.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/64062001354.pdf
    • https://bliznacite.dvsportbg.com/files/81016164477.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e9f1cb781176792bdf668ffd6294c905/823690783.pdf
    • http://drzwiukryte.pl/userfiles/file/51194621002.pdf
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/kagebuvekopezajox.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/63660172056.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/fozinekasapukovowul.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/vazixudulexewakugaw.pdf
    • https://tedesco.pl/userfiles/file/vidurega.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=adobe+after+effect+cc+2019+full+crack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df10.bin
e5d3103b4272964a97e23ded3cebf0f843a9be7393f73b217523d698057040d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 10880 bytes
font_01_sfnt_off0000f880.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16792 bytes
font_02_sfnt_off00011092.bin
ced9591a2d2759e9ea64aa9de884b55c9e13eae793f30b9e227d46e222c43b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 18584 bytes