Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ad5895b34fa7db…

MALICIOUS

PDF

83.4 KB Created: 2021-08-14 08:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e75a665d047154c0d25239d61852c20a SHA-1: 5ad2f25050c182abf7ad4c42e1f81aae005e60e0 SHA-256: 89ad5895b34fa7db243d1e6eae4ead0d7462e6f058de53fe4cce38ff197da90a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=present+perfect+and+present+perfect+continuous+exercises+pdf+intermediate PDF link annotation
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a8b09723---mofuva.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac330964857---36048096398.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608198497b108---10869160337.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/rewuked.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/46442321508.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/dawegarojukigoxapafovevox.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/86372514684.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f2a61737970ecf51ce5f386f6f11702f/91867221467.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/5330198654.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210617_6D0C2209830A038A.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c8aad20721fec4e885f74266a947c49c/dedesogetajufokubeji.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/daxepumevafitinuwus.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/7957680956.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793ab781a10---wanurinufukazuvorapuxalun.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e6a1fbbec93727c8e84bb41aaf6b4469/dosipuwubopo.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/dalak.pdfIn PDF document text
    • http://yoron.net/up/files/22819078027.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210812_D2192DF68F9DC174.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160cc37a85e29e---zuzavenitadufesi.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/buvipi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088733db9f30---remefekanufegutogafi.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_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 17072 bytes
SHA-256: a3de4079532dffa06cce9c4221ce9102f5607491bc2efb9ab43a0524b834fd9a
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 10940 bytes
SHA-256: f49c27209c523278ead0adf2b355cc672dfb4f01fa5ad48d5f56df56b86ed3f5

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