Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0a5f2201f96d64…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 05:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ab69315e473c8cdbcb548d25067853ce SHA-1: 37c54230d40522e9b091bade924c9f651d0726b5 SHA-256: 6d0a5f2201f96d64d515c600193b92726f48f33fbd0f645afcd856f944893a22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=roblox+hacks+fly PDF link annotation
    • http://adbrf.com/files/fckeditor/file/36326041061370fee3808c.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/legeg.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/61145289115.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ba8c74c8d112ad05aeb3e79af1adac6d/tadutogelo.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/37195564981.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/79593513304.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0gau8m4c193od8nduqcdkbr8b0/jifux.pdfIn PDF document text
    • http://104408017.linker.tw/files/79217241593.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u95vjt16nvkc05ft0bht43ssid/14717907748.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/pidenamofopuxuz.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16146256c2303e---bowalifug.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/14284210503.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/67680193628.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/22599986844.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/be0dcisdm92fj2hfb06abi2ap4/6450955983.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/96733605123.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/82075091854.pdfIn PDF document text
    • http://bubb.cn/up_file/file/fonuxop.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sasupodotikepekowageb.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/38ec7ec028fa6c8197153249aa09186f/dojapid.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/sakobuwadixun.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/49242147748.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/30162266678.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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 18004 bytes
SHA-256: 1ab1e266194d6f3765900d11e12c322d5bf8f9f1a0925a93c23eaf8beb17e18d
font_01_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 10400 bytes
SHA-256: ac8adfbf84cc6ea6f32b76fb3dd11fd488c000f4063bbc80e528e90a30d0520a

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