Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6786ff49c80514…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 08:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cb057fc2d562827bac60a640d96fdcd SHA-1: 7e00041510233e19ad700b064c6a796c11c72ae6 SHA-256: 8e6786ff49c805147267c889d4be4b3eea0f193b1e6f1a6bbc0cfcc358c36e75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicative of a link farm used for malicious redirection. The presence of embedded JavaScript further suggests potential for exploitation or malicious content delivery. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://nena-artspace.com/ckfinder/userfiles/files/mamuwito.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bea70f649---daxera.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/3148595472.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kcem19bvgo18sj6aid0cdlioi5/wugunib.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/66002616508.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c507c17f7ef47c3f2b035a9c99473e5d/mafixu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/56253378943.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091416065273499.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/loxawivukibeligaxenivo.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/38445110045.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/2912755983.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/04b92d77bc6da6121d1904652059e6db/99475556067.pdfIn PDF document text
    • http://apismorava.eu/docs/39362072043.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/nitabe.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7f86bde8---41383361846.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/97303328881.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bemavexasilavawodozudal.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/28184668428.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/1249581140.pdfIn PDF document text
    • http://montesantangelo.it/files/files/jezazepatusorutawumupato.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/3701591045.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/15011638166.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64498929498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+app+to+read+telugu+booksPDF 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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10756 bytes
SHA-256: 27821c34f239372337f686ff179f3516e1e491f42574537ab6b2a3e06acb3c4c
font_02_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 17480 bytes
SHA-256: 55023980033e0570b48fed40d93f0d8e6c1f034068209ffe6fcd665bcbb82bf7