Malicious PDF — malware analysis report

Static analysis result for SHA-256 78799cbfe6fb0419…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 07:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be0047ae370b85bba15bc012e4c2c9a0 SHA-1: ca3835a89f6835c3a1070798a2faf317819f273a SHA-256: 78799cbfe6fb0419330530830e33d39b74b089ab6f42d5ea888c53bb00fe9082
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://mylodge-naoshima.com/images/blog/file/lufibi.pdf In PDF document text
    • http://planbmedia.hu/files/luvasanunumojelomunenaxo.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/voloxuvodarunodi.pdfIn PDF document text
    • https://pr-dienst.ch/file/maxinevebokas.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee17d1693---62184081203.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e687f7fb---wilerutanolajapitunolaliw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c8c6a2f9df9f29f4fd7b945f7a901408/rivibiki.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xiguwanuzowakitojij.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/wewuvupawetixugi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/20807030847.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/pasuvunabomixijunedake.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210908_123108.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109042359382528.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/womezine.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/1021538821.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/pizebe.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/resotevutixip.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/mutosani.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/luveruxavuviku.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/tasiwan.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/zeteropepoju.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/guxinafefuzaw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a9a0b22e2aaf8574fc05f0abf3fdf9ce/disosazowofidisexisav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cute+anime+live+wallpaper+androidPDF 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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 17612 bytes
SHA-256: 7e0e7b110e326c55941e475ed2f2d343045f206776819056f0623a293d50ab90
font_01_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 10668 bytes
SHA-256: 9c4fe6684bb0d7b0de1f5f42e80c3ae1efecd33321888139e8a580772115f8af
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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