Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff65813c9d25479…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 09:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8b6ff9864150d5eb40dba4d68e5964e SHA-1: 017cf7ac43116be4e642aea6e6e4ef49256c7eec SHA-256: eff65813c9d2547927c445d03f607c606ab7a5b54b5dacaa8069bd71b4ad7eda
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including one hosted on a compromised CMS upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing sites. The presence of a link farm on disposable hosting further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yukkumpulgroup2.com/contents/files/92211263668.pdf In PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/minuropiborokijoj.pdfIn PDF document text
    • https://duvanco.be/docs/files/18710902916.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/likafexowezumavomak.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/92412943691.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vuragadijex.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/dadudurade.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zujabixositavebo.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/kupuwobixuzuwiniv.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/69181370532.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/65487153028.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu3tg45c8104kg5rllm4tteof5/pafol.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/76513634232.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/46308212492.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/kb1843j6o9hbiub7qfnjq5eu1s/47088544264.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/78618974462.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6f85f998---tatajebuniz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/aaa437d3c73037fc0f051ce23cdde9f4/palizakudowi.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zulijujajejivu.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/37469273334.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/regofixobirulowunerig.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/kovabegabajalunorokik.pdfIn PDF document text
    • https://basisangka.com/contents/files/gabarixo.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/83752189303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=types+of+reflection+physicsPDF link annotation
    • 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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 10492 bytes
SHA-256: 7d492a09ab489a50054dc41578f24fb79657185ddf2bcc9a116bbd004b8758b2
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 17472 bytes
SHA-256: 40def4e6bdb7b3adb9823b050fc31ae9277d68e831efc590dd5e46c7b0e981da
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1