Malicious PDF — malware analysis report

Static analysis result for SHA-256 0108696a5b902e17…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 13:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0efcf46c2ffc57e4ccbffb3baf0f6463 SHA-1: 0b466390a997ef74e278a0c5fb36fdd4d899039b SHA-256: 0108696a5b902e17d9b67eb0ee86c8d4a942e965c0fbca641d6ad434877e7373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to download sites. The presence of ClamAV detection and ML classification as malicious, along with heuristics indicating compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=download+immortal+legend+mod+apk PDF link annotation
    • http://hladonural.ru/upload_picture/mazejagisati.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/41826790021.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/6511388874.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/45807498713.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/6472838793.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/85989207221.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/zezagazebajuwatazok.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/ranigapixerafaliroxir.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/24638564133.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/desov.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/12849729318.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb84fb07c2---64285647322.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed06807d84---87936871443.pdfIn PDF document text
    • https://megashina24.ru/files/files/41711171619.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c9b8a0d88---6928347109.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/zebofudikadipaxakivoviri.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/26459310134.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/jovatodetodamo.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/xexixenomuluwazavirido.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/98332552105.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/02/file/suvewotatimajigo.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/44596542852.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t01tovpchtkd11s15o1gam9d92/30937421974.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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 10744 bytes
SHA-256: d9cc3a3220eba66a67077b5b76f35954907aff7b58922a3740b158f6cfba0ab9
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 18844 bytes
SHA-256: 5e3d215200180a3dc8149c51d2d93c236db7854e8e463306aeb5de78b7326821