Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb3c8bbdb695e16…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 19:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53704224ce434abb2950dbabacfd1b40 SHA-1: f8d724cffd8a6708c93b79548da9a244a4055950 SHA-256: afb3c8bbdb695e165909b56844e3c3f920bbe9b1569166c076196ab3e4e3dd8d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect the user to a malicious payload or phishing page. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amuseonline.com/absite/userfiles/file/noneje.pdf In PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/tuzepoliwepaganuwovido.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210714125848.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161196594a619f---wibusuzaluredaz.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/85809560089.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/99526148922.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/44028337375.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/82775781647.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b896a183f---xodilesovutaz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16121b56476466---jolewefakako.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebcf766faf---kibuxebilagisolekifoko.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2267315d61---giwuzevajelumividunesunu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a0032a2f4f4d1a8075a9760b1fd6a26a/92930254946.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcfb62e61---zapixinamazixaxilad.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2f48214b6---29265811302.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b762785a8---papejagerilimalabalaje.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/35995498575.pdfIn PDF document text
    • https://medius.sk/userfiles/file/89563809057.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/13985298555.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210724_24B07EFB7BCC85A0.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/22555701851.pdfIn PDF document text
    • http://centrons.com/uploaded/file/37770611660b48ab77a9b6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=intermediate+accounting+2+textbook+pdfPDF 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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 11252 bytes
SHA-256: 0b13935d396a68efdde60ff4d69c59a3c54c479ab1e819da742649b872f4f36e
font_02_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 17872 bytes
SHA-256: cbfe5bcd9765e15dd45581a6bf48e21c80d4ce98355d91235c399080f597d4a4

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