Malicious PDF — malware analysis report

Static analysis result for SHA-256 292a8d1d72c7b5b7…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 19:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b596d86644b2a0d3e32edb350aa51484 SHA-1: ed8496daf5a20a4c3fcc44ca69e77e459f48a8f5 SHA-256: 292a8d1d72c7b5b775ee730ca1801174a2f858501aac807db3dcf84fd73be623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to lead users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb2fb4fe0---46179032877.pdf In PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/61609952800.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f67ef377348389986a830149f22f8ff1/gutapev.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16156c677d277c---85483013496.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/21722068142.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3c90d1051---39593669093.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdf3fd74091f4a29156ef3ccf28fb2a6/95906408370.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/3173594954.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tatisulapolidafefaj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e532dbc04---rezolisapopa.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20211001070032_ODUyNjAwODI4ODc=.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413afc3ee3e---wubaliduluparelorojifus.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sijagezivadodemok.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/27779636903.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/19540454984.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e36453e48---nedenalozonakiso.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/1953843954.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/20e9e08c22d563eb68d2cb16d9a0818e/tigilalirifelaxiwo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kimiduniwegiviranukemo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pitiponotinuf.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5a0e6862---nudasukafenaladisisulu.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/4824764969.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/12650617307.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/purevasagu.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/65074925500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=installare+applicazioni+su+androidPDF 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_off0000b2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B7 14944 bytes
SHA-256: 4b76e9fbead3c493ac0bb4d49f3d5144446f63082b0383911a0b3ce91b54bbf8
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10616 bytes
SHA-256: fe048b883afd373e9631c7542dc53b7ef708e7aaa70542f521ef02d94c16b3fc