Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3025c167fc8bbc…

MALICIOUS

PDF

89.7 KB Created: 2021-07-04 16:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87580a1e54311569da1678b7aae5a29c SHA-1: f42b749b28b02bbc8f8d493c096283add25b807d SHA-256: 1e3025c167fc8bbc18a8afd3ac45ea1f3fd9ec25a33dd3a864d33ef7e31ef754
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed6a75f1127b00661039244c03862e19/sezejagofafubokipij.pdf In PDF document text
    • https://annjulieskarpmo.com/userfiles/file/3237222040.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/gidaxokiguvaxix.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/pamizusuxikiruludupul.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c714958f7d6---rizugunifuginidulume.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/91554175f98a57a4b0aad3b8b2ab4f2b/33324300343.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kavexatuwexodim.pdfIn PDF document text
    • http://proxima-design.cz/files/file/matefudefasinanoxunolib.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16209658995244.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/lalilokixog.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a77ee8005---bagiwezigifoj.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7973349a2834baaf57a4f806b604d8c1/76814253901.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1e5b707d331f22b8c2e38cd4b5a1ae27/balolenedifuzukevipep.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1098cc618e---zisanu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/4939023375.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/39576555559.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dad74f8e17411113ae851fc0bb502dd2/53998416669.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/h6efuqnab9h7a7khr1c7dvqh57/jefenowumuxomovodorew.pdfIn PDF document text
    • http://nakatka.com/files/file/bifizavobax.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/4459475717.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fda5ebbc93d04e721072a7924ede90ef/35300397934.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9abab7014---keragodamividikite.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/28671413651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chihuahua+teacup+puppies+for+sale+near+mePDF 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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 17400 bytes
SHA-256: bc4de9efd05b2b6003b00a372d5d41b7217fb779b9559833857bf2ad7b678205
font_02_sfnt_off00014085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 10876 bytes
SHA-256: 79dedf8486440e2d4c0f68436e65ef15826ccabe77b1892b88b82bc2c0f3be7a