Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8af85fed9b31109…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 19:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 627ee5921c676d4870c0d686dada844b SHA-1: ba6c14d877a3b2a9450530b99306afaeb8e6ab47 SHA-256: a8af85fed9b31109ccc0dd71663952831f0ecf434cac50d0016129445765439a
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 CMS uploads 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 for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=hollywood+walk+of+fame+map PDF link annotation
    • https://villadorottya.hu/uploads/frontend/files/ranomaduxuwolulibanolujo.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/44959077850.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/55993456527.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/vepitakixodunod.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210914172801.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/vepuzekonapidukok.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamupeluvumolaf.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nadezabosisozoxudo.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/ravevefekolowubawokojako.pdfIn PDF document text
    • https://comfort8889.com/upload/files/31182671275.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/bofeligidu.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mumotuwugevewazu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/88921471046.pdfIn PDF document text
    • http://twilaw.com/files/files/vozogifakusataburika.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f08023642---61763954629.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/14073310487.pdfIn PDF document text
    • http://becucci.it/userfiles/files/bafosubanakadufiwo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/92402991241.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109130854073954.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6732fe73e274827aac01193ad248df54/58395205304.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/8332595941.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/muwalumakinulawiz.pdfIn PDF document text
    • https://ebooksweb.net/files/file/37003117868.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/74532043633.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b637edee---17719986008.pdfIn PDF document text
    • http://cl-pub.com/files/files/45936966047.pdfIn PDF document text
    • 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 17272 bytes
SHA-256: 525af0e1653657d173347d0ed204cfff8673ce9bd7b4e52ae1c553a3d9b2d8c9
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 10380 bytes
SHA-256: 9c003452016b4c818a58ebace55774f789e688513cbe741dc6b451fb0aa82b2c