Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d8f5ead431cd08…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 14:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 636a42b991089d21e35304734d071c8f SHA-1: fbf0935daa1955c9386e5bda747c57214c5d6d70 SHA-256: 95d8f5ead431cd081f058e9c50e815c91064cd96bbd7d013d76586ce2c25a2cd
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a browser extension installation lure. The document body is heavily obfuscated, but the presence of multiple links to potentially compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall pattern points to a social engineering attack designed to trick users into executing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6d1334506daf694cd4530edacec96f9d/71415042034.pdf In PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/guminaru.pdfIn PDF document text
    • http://wamer.org/userfiles/file/64026345355.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/54641861715.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/sc6qgm4opur4t87j9dg0udi4of/70390185652.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katesosufevavikezotomi.pdfIn PDF document text
    • https://wsbtitan.com/images/file/49713309284.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/karepidumiboloxev.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a70a72935---64951780339.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/aa61f9c5e17a3721d9f7a54678dd1575/lizimubukap.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081e61bca323---45475250409.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/21119c2362e97509cbda7b890d29e46e/74410178600.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11561854d---xobeled.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa89460404---goxowopatewidikuvitajep.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/2270245343.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6b81c2bdb---rexexopakasofusunaxomitan.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/97677825424.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b380fdc2398---wutitaluxawud.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27d3ba2d2---wobukojiwoxemi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/veturufe.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/47186621961.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/5355003958.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b932989b97---lokamiz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba716e6e948---febizeni.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/o9sa29a82kfet2ikpc30e2hh15/54051256634.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kifevowabefagaketis.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/77632777299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=restore+deleted+history+google+chromePDF 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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10712 bytes
SHA-256: f294694eea1d883c49bb2b6eedba3fe4b2b39a809b13a796134154aafcf108c3
font_02_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 17164 bytes
SHA-256: c372e8200cc379c131ae8ec56a6def2848b7d7a3f27461854eae7b5be1c848b8

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