Malicious PDF — malware analysis report

Static analysis result for SHA-256 e395815a29b52a13…

MALICIOUS

PDF

88.0 KB Created: 2021-07-17 05:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2263470ed22392284cedc0c75576ab4 SHA-1: b88c664038a41ebfe91ad0375fd96c9fdbe9e583 SHA-256: e395815a29b52a13de725fb81b0aa9e7d9c05c52e9b038c9fd09a11bb43a2e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, specifically utilizing form upload plugins to host PDF files. This suggests a phishing or malware distribution campaign leveraging these compromised sites as a distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lj9qdjjotiijds4v58ktln07de/xetikesivanelovuvutagemi.pdf In PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b44e941a931225401b2d015d87fdfb18/87403751957.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f97885e1---sexikatetixufo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/75346231618.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7d8a1844d4e483a332151133287bd2cd/53420211268.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160800ab57e1ef---vokulazorugibem.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e3a4a2e7dbc8781491dc48f23673e606/51561334285.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/27219846931.pdfIn PDF document text
    • http://adveotec.com/img/file/sujefigesagabot.pdfIn PDF document text
    • https://sbufficio.it/file/fopabipebi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9009a391---wapufonodofubigedakoxegi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7a3f0175257270df7e13fe8fc1846d28/telubu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa142166ca---kibapelomazelovipubom.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab8a506e6---8043574600.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/205c3beb3b44f298844a5ea142200e98/sepimibefexurizebe.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/3uv3oiss46g5c5hv0sbgii8rl5/76269672810.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/gazijovipazotiwuna.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vamunaluxezexuzadov.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/86106735935.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/iu2slai5be0vhfq9bgr9ar8q5m/firinofaraw.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/wagofirexemogunevuroluni.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/17775232038.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/61479270397.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d076817c01---91369672107.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a04db842---lexanasivamozisimuge.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/pilowekep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lust+7+deadly+sinPDF 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_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 17648 bytes
SHA-256: c5ce44457de66a11d24d5912dcf63260ed0bbcfec26c87b87459842fc98b7fc2
font_02_sfnt_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 10244 bytes
SHA-256: 3e0d76f5636bd951f22787f834bff6e92b0a2ecd1c59e64e6083272b816e2d42