Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad93bb153bfcc23…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 21:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca26b47076b67e73d19f93790ecd2701 SHA-1: 84a0e6c1f6203aa6c0f955b5e2543e8fc58341ef SHA-256: 8ad93bb153bfcc23605d525e64ebf291dfc33bdece4e8f81e90798f80fcd3e62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs. While no scripts were extracted, the presence of these links suggests an intent to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c74774da---mamijevawajefepuv.pdf In PDF document text
    • https://zzarosiscarampola.it/file/92603009962.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/86957525929.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/8292854337.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cca2dfd06eabaa7078100c332f0a50a8/patiduwam.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/e2qh8c10v3hhj72gfvemg5thja/95887441577.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6a53986e7ff298a1b6f187f7f61c7ddf/90899206258.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/45319777361.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e1e64dc8---mabinuwovovagonarewevevit.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/684c6d2d20803baf64194abc734994ca/72813079237.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/folenatomo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45814594487.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/47680975414.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zasejagukofobaroze.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/99585494890.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/73797364834.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uf9pl025e1b8qqko78efl2iq0o/38099657813.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc25b6d285---36774129976.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6a24deeeca2831753abc9bd0fc6e29fb/fabokagud.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/5761033839.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc53e86aa9---31543380519.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/xirememavavesani.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/34f489643a001e80d9bc2d6a5a50dafa/birifawodet.pdfIn PDF document text
    • https://tigaintan.com/contents//files/33364260129.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/konokakemobabufagir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ibps+po+2018+prelims+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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 10888 bytes
SHA-256: 51fe426a8cae137413f0dafc5a563d2bdbc0f3e57b09160c6799bace0e560cfd
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 19096 bytes
SHA-256: fed23b1720fc4af51eb3f7b80be3bcb52d70fb5d4252c5ebccf094a8b0062ebd
font_02_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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