Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a348e92a5159ffa…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 00:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 57d0e3dac75e1df977485d711a08280b SHA-1: 5d084640fcaba9dd9f80f8ecbf8126e40931bdb4 SHA-256: 5a348e92a5159ffabc0bcfec14e6d10d77fc88e328e915b2b5237309f29983a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://beysukonaklari.com/ckfinder/userfiles/files/vajulag.pdf In PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/tojezixeliroxuvozetolo.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/rezileru.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/70673934468.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8136d572d---73144789182.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/nipibekawofunuvelalaloga.pdfIn PDF document text
    • http://packamate.com/userfiles/27969259057.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614131f1b7cf1---84690477621.pdfIn PDF document text
    • http://metallpress.ru/files/27527147658.pdfIn PDF document text
    • https://noventa.cz/media/files/file/39467593563.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/darifumajo.pdfIn PDF document text
    • https://network-italia.com/file/rolizopivo.pdfIn PDF document text
    • http://fteq.ru/files/file/11848760163.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/dudaj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7f366eefb4246c54a259ffe9f3ff7258/99241606596.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210918060509.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/paboxidupuluxas.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zurajapuwufa.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5f496a4a---4762047433.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/64624185287.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c4991880---87573203921.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/98975781606.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/79390825936.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/dugajubofilago.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161399941a4bf0---duxatufabolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=maa+movies+live+streaming+online+freePDF 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_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 17636 bytes
SHA-256: 1d04ee419d309edc5a644e3e061d18543b7425c1020c27634fce13fc7dae2128
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 10616 bytes
SHA-256: 39b2c8b326a56c9bff6345154f2a84966a9538fecf8ddf1406feceb58b49864c
font_02_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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