Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e6be8176670658…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 21:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0804fc072071136b627d34817d059366 SHA-1: 3b2d869869693079a38df0b5ee7bcdb8e0a4042c SHA-256: 55e6be8176670658cd72140dfcef1458fcf15ec6a38112d979399a27b6b9a518
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://splogservice.ru/content/files/22684738272.pdf In PDF document text
    • https://sabagdasarov.ru/upload/file/94945120494.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/68441380919.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07e350fac---5617115080.pdfIn PDF document text
    • http://davcpundri.com/css/file/38823236891.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a612e73dfbb---tasuvofesij.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfceb5cdb---tefudipapisise.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/89756857861.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/44dec10704c1ca91af8db535b2e46340/45219687006.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210716114819.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0e684b24500a5a36a2198ad0c79cd547/34111336445.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/40251377164.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/90413945438.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf4dd7073b---31222847051.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085bed3587ce---5777291695.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/71826192947.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/satufi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/jeruwagalafadajixara.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210603_193444.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210819160150.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pifovategipimireju.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/17340843867.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/53546415242.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612378343baf7---73241110861.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61459783865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=national+cybersecurity+workforce+framework+pdfPDF link annotation
    • https://lapdonline.org/file/93043577303.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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 17928 bytes
SHA-256: b1acb2c0436cb34f5ad59c614a8f655b702eb2622727aa4fcc9d7e46b0336d6b
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 11292 bytes
SHA-256: c61ac422572d624b94108b3305a95bbec204ff6e60fec1fb34289bd98220cbe3
font_02_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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