Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58b0cf128534c0a…

MALICIOUS

PDF

84.9 KB Created: 2021-08-18 22:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edf00bc73d8e2eabb648be0bcab7bd3a SHA-1: 55408218e886c477fa5caa4f261dd262e8e91351 SHA-256: b58b0cf128534c0aeed4d204f3967505ef73e7a65027821b952b82e95217b9a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings confirm the presence of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crysiq.ru/uplcv?utm_term=diferencias+entre+vertebras+cervicales+tipicas+y+atipicas PDF link annotation
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/22d566ed3dc6fc65c69f6946dd58818a/51576260895.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16d4baaaa---52993742183.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b992cac1c54b08fc6f14c66caf0cac71/nopufe.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b4a09b2da---bawuvokemezemuxexalefifen.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4954771f---68450756320.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/xanuloxoz.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c29066d143ded16218664283bb24f71f/pilopomuvagezupugi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077653dc81fc---37064752044.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03688a4d6---83534810109.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab40766bce5---93670230107.pdfIn PDF document text
    • http://industrialdevices.in/uploads/18350526756.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210715_453BAB3005EC7869.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210720061852_57270739.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/gogosojivev.pdfIn PDF document text
    • http://jarosi.hu/files/file/32488342388.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cf0a52a20---1227576765.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/91049390939.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/tuzuzaso.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763836ef721---vagimidu.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/limanazadutugowexazep.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/66860847856.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/tufawogawegupi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10672 bytes
SHA-256: efc0f89944a1e0fcbb5fc1d3f8bfb741998b2993cc81a9a2fab9a6fa319c636c
font_02_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 17396 bytes
SHA-256: 17ccb01f9b7e7ba4340b7dd3fd263a154e88b5de9fd4f25d2b094768b7211103

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