Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d350dba2f15187…

MALICIOUS

PDF

79.1 KB Created: 2021-07-24 02:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6c329507515d5e2a0f7d93f98bf35b7a SHA-1: cce298a06b827c826757a0c573ea2eaa3f5f7f1c SHA-256: c5d350dba2f15187861a55d7c62f8ff3369c9046f2fbabc92dd796b20b4678fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://jshtextile.com/UserFiles/file///pigejodu.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083deed5adc7---nukaparugovasanosaxi.pdfIn PDF document text
    • https://rm-parketi.si/uploads/mifufobanidix.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1335d5e6e6fa3d7466064d2e548c857a/37296207132.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e916b838ebe068467038d1fb13232d4e/fapizafevudakinabunov.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a282e21c---gagixuxuviku.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94976123556.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/3482244977.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vi0imicu2v91gb05cb4fasr7gq/zupelunabawarojuf.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/43272735935.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/99172111791.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jv09e8famdfhi9oogusmh295eb/87074607161.pdfIn PDF document text
    • http://www.toptehnik.si/images/94979852304.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/396377305.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fcdb3d76---23043033556.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f9f2d0d705dbf84426d2ef1c8cdad2c5/zuvufogavumavawi.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/43066909847.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/61050358058.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6e57251515861eb564c14bc5335c5993/66410419584.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac76e934f---28347773504.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/kugoseza.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc8fa8230f---zipata.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/tudemapowilu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/10729349694.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/kiwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+full+form+of+bpc+in+pharmacyPDF 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_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 16864 bytes
SHA-256: f7dc3ea77abfbc80d41875fadd92f7076d52a520de5962411c132f32c1b4d66c
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 11092 bytes
SHA-256: 36d144c38fd35527b9316b2daac477323d8032b1f25e76b167f7edd095e0cacd
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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