Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8dc54ccf8e69c4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-10 00:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8e9dfc27b04716c2605f17d34d5843b SHA-1: 5c172883a2df3d7cca130d02c3c393ad9c0f351d SHA-256: 5f8dc54ccf8e69c4effec63feefff00e5cb4e8d2b97e26e4898bd84a6fa33cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=coin+master+mod+ios+download', are likely used to redirect users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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=coin+master+mod+ios+download PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160709124e58ce---22744643909.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d2f4a7aa---lezuribewifuxanugifug.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/10571355435.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2c1a7f7490637ffeb33887bab4758734/11119391645.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/kusovavetaji.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/18844451033.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/1859691490.pdfIn PDF document text
    • https://kuepancong.com/contents//files/61261630859.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/aie76mc66tm5cstarnd5932fqj/30238251898.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/997093f1d89e9d81b429efc65c5f3153/xewekakewulawobo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/euop6qkmg2bhgjej69j0hmht00/57411579205.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b65587b4---rapimetobavegepowa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lhepff9sc8rof6iqqsf563abu2/78269319532.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210702034912258887640.pdfIn PDF document text
    • http://dnepropress.net/files/file/netusuvajige.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608e03c41492e---menilubalisirowag.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/gaxopi.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/vigovakula.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046bc5e659---47072045859.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/3v6pt5vstrk5fht01cvq7i2e38/pejajopenexanadovuz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607127e78eea8---sasiwuwesigokuwiri.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4783fb2b---wovobukek.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/21913722031.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/67903331908.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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10524 bytes
SHA-256: 5ed58eff6a40444233c02b988a5ac83b56859819b4c42fcaa3d40a17b39e2c19
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 17588 bytes
SHA-256: 6dfdb30b70171e20ad5f4532ed170afc878cfcc5772a5ca83df1ea1cbd4d3c89

Open this report in the interactive analyzer, or submit your own file for analysis.