Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92f210fe1f3e4aa…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 13:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71c453d1afd3cefe1394ab1c292d98ea SHA-1: f541aaef60405c4b589429cd322bc660f1ac82b4 SHA-256: a92f210fe1f3e4aafe45214b1615d46401402e1efd580deab099caf3becdf3af
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a browser extension installation lure. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic findings strongly suggest a social engineering attack. The sample likely attempts to exploit vulnerabilities or trick the user into executing a malicious payload, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://simonhoirup.dk/userfiles/file/23848951964.pdf In PDF document text
    • http://sparkpro.lv/content/file/9747900678.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/74761034575.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/fifobigepuvila.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/waweganikaxerisirikutid.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nvpa70otf6864unur42l95lgf3/tunobeso.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bufikobedebomatewatu.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/30414183029.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4h68hvt1e8io8ekpom54jv0ak5/konifegaf.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2aea2a92c9638dbcd3ab2632b05b1eb6/xufarabugodamum.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bnm80l5n7tr5ml69v8scnul766/jitufitutixoboburidagute.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/nujevipofepalu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5c19339dfeb49e925e55904eac636288/guraluredezevil.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/75262898351.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f149e97a---tesejopawi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/29k7cj9199foe75hh4v6ujdf41/9136506826.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/bemefovexovabunapowevojez.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/38687953024.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nujoluwimojitamoxamov.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pikojiz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160842fa9973b0---kapomuwilomisa.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/730d8969bb9b798ec890eadbf120b8e7/kavuv.pdfIn PDF document text
    • https://castel.ro/userfiles/file/98584381323.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/r5ihe8dkg73pngib28f53pu3p5/67465932310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mov+to+mp4+online+converterPDF 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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 16896 bytes
SHA-256: 215f35c2e58d2e68029e4715c7b4ba643e14bf92d3e9845253fe9c4cec5b86f6
font_01_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 10340 bytes
SHA-256: 3d377185d06671aefcf6fe324d30a312646a868ceadb4757dd9204173d4926ae

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