Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f2a261b3d0686b…

MALICIOUS

PDF

81.8 KB Created: 2021-08-29 15:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 836cf9331ea39e0bbced57bc02f40738 SHA-1: 3259ec5ca711f5d5cb8e37d0f8a331ee4bdad98d SHA-256: c2f2a261b3d0686b8f7d45ed50a4956e95645b81b883844b6c6c5e8b3857d523
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malicious content delivery mechanism. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, characteristic of link farms used for SEO manipulation or to host malicious content. While no scripts were extracted, the heuristic firings strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/vekimosilapepesono.pdf In PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/nudofo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7b336bde8b7139e68ebaaf59fda96ac1/nateke.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/19235831056.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/e5se67l81opnd4tilh6ne67lt6/80083988063.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/310o5ngpq8nb143mjqqbv7rbum/58475191979.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/siwigi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/08c12b877562297a438fbc1a85182e85/54537580374.pdfIn PDF document text
    • http://hrudolf.com/userfiles/rudabarukoxajatududopat.pdfIn PDF document text
    • http://vit-physio.de/file/57593157650.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/gutagisofilara.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-02-18-30-31-64.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/46524795250.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/nikul.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/dotav.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/poparididirez.pdfIn PDF document text
    • https://dhesient.com/media/letofo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161182fd8275f6---5589676513.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610de70f57b0e---sovuritefutiwukoxa.pdfIn PDF document text
    • http://locke-3c.tw/uploads//files/202108051159163616.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/tulolejujojo.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mldtt7jv30jgk2s3cqu3jhod3a/karasowavomunawudifub.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ef43131bffc89e97b74e1d208c935bfe/roviwidusuxeti.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/vifozupepevuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+get+free+diamonds+on+royale+highPDF 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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 18520 bytes
SHA-256: 14e65e2dfd649963875b857b725a1a30cb4d24144b2828b1d1362374f422e8f0
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 11092 bytes
SHA-256: 7a52d3c67fcccea8e8e12c8e907d4b08dbb9ce94d00adb65dd1ab95bc9d9c8d6