Malicious PDF — malware analysis report

Static analysis result for SHA-256 713c8408f96c5d6a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 14:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4a0e2803acc7350cbc24f86f42578dfe SHA-1: bc17e0ac5d0597089de464e8d8fb3351f16a0939 SHA-256: 713c8408f96c5d6a46d00914ae6aba81d550ca7f95425f9be89f2ee0fa4c2dc6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URL, while marked benign, is part of a pattern of external redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://titusauto.hu/kepek/file/88173482736.pdf In PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/26839387979.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/11588e7f847a135451d9433849bd9582/98461566504.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/87238918373.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/52339534298.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/92426965629.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/13738193937.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/10132497451.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jiom2k0jbkmjl7o3mc3cq8h40k/bosotetajenijaxuzes.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/sofunawomeso.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/8804416248.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/towedegurivik.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tenedamasojewusadipe.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/zivitewamerogumizikakabam.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/35955805466.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161418f2adf290---57807526218.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021916192555286.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140d99d72fd4---kiguduvejetutemewaze.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/fimulo.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/juwavotob.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vagodizewibavexomowuki.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/jirunegosu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2d44104c1ad8b6639efd64d169796bea/zevikanofamexiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+myabl+appPDF 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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 18052 bytes
SHA-256: f1801a78a077635719538b9b75ea3daf22667546bb00680199dae37d8cef2c3d
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10304 bytes
SHA-256: 7e525d04a898d8a97eebaf922ea35f85848ebe2295819e1521d68039cf1f8908

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