Malicious PDF — malware analysis report

Static analysis result for SHA-256 e049c6c28b2b15a1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 05:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4b79e59d26f5578029a075b83d9c4a7 SHA-1: 14fc28b16d5179608892d305787cfb6831ffb071 SHA-256: e049c6c28b2b15a14b39d36b2e8ff56ddfc1b7f3fe4f1e257df0bc6d1900be30
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

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://toyteepee.com/uploadfiles/file/210913235243774968lf3tge.pdf In PDF document text
    • https://firsatpin.com/calisma2/files/uploads/66485809772.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/wujufivow.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/713b4b582a1273ad32257d32321e0606/77188448329.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210910_034224.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/subefujinaferorisoj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa5987f024---luxogil.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912024830-10654724087.pdfIn PDF document text
    • http://chamdure.com/DATA/files/zasuzezegamibezadusiwugik.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/gizotogujodeg.pdfIn PDF document text
    • http://hotechike.com/files/files/nakoregokifazitilakabi.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/jawivigowam.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/97400633220.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/63601904519.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/limopuwilonadagusulaveko.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f403dac8c8a3087709ac50b68bce00cc/43265253748.pdfIn PDF document text
    • http://poiskvod.ru/images/file/27320921279.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fuvetetozusuna.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/58962871355.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/gixagan.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332f6090f80---zisomawosovatirosonujifa.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444906b9e53---46188597087.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/xatedasopavinasurubarof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=32+bit+parallel+spacePDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 10480 bytes
SHA-256: cfca78dc8b612d58752b93b3058c2a040b65ac46fc758fab84a6bd3d4877b503
font_01_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 18024 bytes
SHA-256: cf0a9d4701985f5ea9159e438407bb2175e62cbd66a55d06a060aca529c57d38

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