Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61e51a51170448…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 18:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86b2fafa22172872edb77fb18b93fba3 SHA-1: 4ab340333e21b415f2c726a7cf5950bebee5d238 SHA-256: 5f61e51a51170448be0e86949c8b77f58804313f1c8884966d5915595dfcb017
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070172e693bd---vukewemij.pdf In PDF document text
    • http://dezmaster.com/userfiles/file/13009495561.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/12498719993.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58e58fd50---doregovenegafemawadi.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/baligamibimimoni.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/xikurabasilixa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a92808454c9---gusudawalijekazigaxixe.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/58280523633.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da5ac4d245---kudagak.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bepuxoraxoxovutid.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b0bbbe56f811dafcffec046804d0e067/zolegofa.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/xubanizop.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9cf1bcca---nezajofoluxo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a80e15bdfe---bikixezogomop.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/5938345074.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665cba2e2e---kisatenumub.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/89419523132a760d3cdc7cf968e0171d/najazexalowajixuju.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/zufuzozilexe.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/zibojunetazexano.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/80147322593.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/9709816421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cours+de+d%C3%A9veloppement+informatique+pdfPDF 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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 11156 bytes
SHA-256: f78c27ba5a47bbf9a46f42d85cdd13a2fd298d936a418933d244519fd60ea173
font_02_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 19244 bytes
SHA-256: 091f8ff9e538242f954aec50b5421304283f6caa9bd927340852dae48c59389b

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