Malicious PDF — malware analysis report

Static analysis result for SHA-256 0900aaed58b08eab…

MALICIOUS

PDF

89.0 KB Created: 2021-08-09 00:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1346cf0132a483fa68060242a791e4ea SHA-1: 29886d904f460c4727c011a3b4f6c63d52abcd59 SHA-256: 0900aaed58b08eab16b6f44f62c9dc8fbf547536e390bac772013a6944a43881
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=brentuximab+vedotin+ctcl+fda+approval PDF link annotation
    • https://aadharshilaschool.org/userfiles/file/fofesudikubu.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/darixirukasoluw.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/9998156795.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d22234d1---kaxarule.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ace92269---19201023989.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103ff80a1e55---87982118729.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/28305080460.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/31671340192.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/40458551746.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4b04b723---42991412475.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/totadokamelazo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/25181554164.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/46076402147.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/kopabufavewibipeparajavik.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22fa22c58---sunabelivo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/819b9d98b5e7d4ba8d2ff966882c537c/68181070184.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/16257003333.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/zilisutexo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845425620c0---darusez.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c2f872f43---nuguj.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/45299724496.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160729487d41d9---nakivolidulomobefa.pdfIn PDF document text
    • http://cobmedia.hu/include/mivizusiwa.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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 11076 bytes
SHA-256: 580c10c216661ab7abae31abf613f2a94371af4d8d82989ff58d63878106fd58
font_02_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 16972 bytes
SHA-256: c56b30bfc1ea6fb662380e7e2507a9b9dc3ef6fa29d179c35e575f8ebefb22a5

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