Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b763768557e6293…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 20:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2063a1a3b74757ed12ab9c4b457993d8 SHA-1: 34f45cd1af80049d82eab5c481f74ac0544f7864 SHA-256: 9b763768557e629383560965bd54cfbac0e52a537432e145d13f0f5f651101f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 https://farmacieitaliane.com/documenti/file/98802936685.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1159b486b967276cede0b0f38dd81a32/81225108939.pdfIn PDF document text
    • https://km2804.com/ckupload/files/bevixe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbae1927f2---93352868095.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/waxifag.pdfIn PDF document text
    • http://cwesp.biz/upload/file/dasamutufe.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/pozoti.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/jebugotuwosutimerufijuf.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/kivewez.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/52280971315.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/8677608572.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/lolojo.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lojigomisid.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/voziputa.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/777520495.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2922b7302e3df1bb8f1d12c058c7ddd3/57473243737.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/refowifabitu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/vorotavonetuje.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/16324192014.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/62965720330.pdfIn PDF document text
    • https://durimawar.com/contents/files/43195344944.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/nolimobaxosazebavunopiwo.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/selarufazumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vivacut+pro+free+download+iosPDF 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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 17248 bytes
SHA-256: 0c4c85a7294a0d353aa8c013886a2c5fc94acde66051291324b48153d28786e5
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 10832 bytes
SHA-256: 190273e9ed6c4c9739cba64906c6df012adb1145aeffc54684009e128c5f9d75
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1