Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a939740f97c06f7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 03:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b7195142395234d2b98fcf2bf747fe08 SHA-1: e8d3720b5e32a4f3fb31c98af61315a861e1fee9 SHA-256: 0a939740f97c06f70feb3684aa87d23f1b6d68e0e9544382858d75c2c2b323b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of link farms and the overall malicious verdict strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://explosivedevices.ru/media/file/38528020270.pdf In PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/xuxuverezuj.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/fba792f20fea3abcf1a9e237c1341152/59751685697.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/pulufebavimi.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/savofasevatibefewok.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e6de5f1cu4mak2nipl6cm5b4r/49707293619.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/81eb1fea5e8901074d1c3adbf04e574d/472100107.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/ziwibisujeruvolepisile.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99070fed7---venezosesakadaxogeku.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/23451566261.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2000fe24---durefivax.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/wolux.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/58958654492.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/gorotodexomisizoka.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/850f16e8eaa6b5e8b212627216005ad9/2196262024.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cdbcdf346---53627498957.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/uomabakulocg7b3cpibqs90g27/teluwixidedorosuboza.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7688f89e89a0ea894841c84b77385e54/didepipobopo.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/sevaxuxiduretex.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d2d72fe5a676598e2bb2195ab68a7dc1/84853841578.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/gidimawopev.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/pdaqpte5vpp6jal2946bbstujg/78291488391.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/50658696212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=multiplying+two+fractions+word+problems+worksheetPDF 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_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 11592 bytes
SHA-256: 520e3a4415110b0f1f8701d1e82981b59682921d30e37c1ae14e8b5f1dd3225a
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 18856 bytes
SHA-256: 7168c518834207501d3d10a169815aa9d146aef2e50905786c5e20dda33559be

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