Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cb603b6d213ce8…

MALICIOUS

PDF

109.0 KB Created: 2021-09-08 09:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f44624b483e1cdc5925aded584ee7a7b SHA-1: 0f576237d51bc66c6a6eb78e85baa11da436733f SHA-256: 01cb603b6d213ce87b846fbf6ed0e3d0caca4624538080f1f69ba5891d0fd5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=postharvest+diseases+of+vegetables+pdf PDF link annotation
    • http://caramelitos.sk/files/26678521618.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/q56kq79jb0a91186v4knmujk7d/79804397167.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee13ea7717---69528678156.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ff89b05f44d---digivolikodu.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/58353328801.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/jawiwi.pdfIn PDF document text
    • http://vo23.ru/upload/file/kivog.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_28F3946428EA1C53.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/0e5ca9c7d16319022f36fc929066ecc0/2096036137.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/liworiwa.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/vilegufaledavifojupapo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bi6rabct3qfecgd7ttk2atnj1r/rolixibebekudijijipemiju.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/2d9dadb5686f53e8284d59850b7e3c3d/jalefulojafakev.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/73980950390.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5632757b943855ef317afefbd02f46dd/47080778279.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/nekozezesijurev.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/r66uaum06279gpqdq38bp6rm36/63150848645.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210529011929.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/83861674739.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/86409015573.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e280d84f0de---75117986188.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rebeguxikoresofotolag.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2d91009af07d8fb9bf10c00a8aecb83/sefosexasinemovo.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_off0001413d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413D 10880 bytes
SHA-256: 5ee5ec21be57e8d94aa2e54eb2d1c389e5db2fb5b8b651755241894e15953f52
font_01_sfnt_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 19664 bytes
SHA-256: 470e25ecee4c484a974aa39907a2f717da1eda0440af415f6fda83a8c2a1bec4
font_02_sfnt_off00018ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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