Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3cd7cf69932879…

MALICIOUS

PDF

86.2 KB Created: 2021-07-06 00:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 54d8b669188672632a9100e0b2d3ac38 SHA-1: 8487dd6897a3cc3b5d87f60703737814bbd7151d SHA-256: 0c3cd7cf6993287996ec521bb09dff3ce3b900ec8efc0cee00d9c4ffb5322f6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gimamexaxidokufabibigekex.pdf In PDF document text
    • http://airfa.it/userfiles/file/bajixuxixomesiponelipa.pdfIn PDF document text
    • http://eventechsite.com/files/files/rikoxobiwazozuvupep.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0a80974a720ba3d74c0b99ac546c7129/worugi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e50b4a8b0---runovovubavo.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/24991368778.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ccb73aa3---30122829218.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/favudapino.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9c39d1e10b33a795b0b50c1f0a2a363d/joxemupipesazosumepejet.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8e7bbb77b---xitabejibamenijepa.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iga2e14b8oromjt27ie9m86d91/19396451233.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/025e722f4577fc3c8cb6677a34a48405/96073511871.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/h5h9fdv6pmeddvamh0l9bss141/18381387940.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/59b94d47d102d5953aae354063b809af/69917307751.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/24541827152.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k82beqr13orqhinoamp0f4gn4j/laliwovupusilev.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d53aa6de---6846443008.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ke6avn8g6f9nn97gs5pukho7j0/winasamiv.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d954386d---64511842515.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/933783395.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3329b5db0b1cd3a56ad0d35588baaee5/24969736894.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9b6032e50---sezaxi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1a31a4bef7a95782825936e329c090a7/zefawudexoselejuzexi.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/11046878027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=neck+exercises+for+sitting+at+a+deskPDF 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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 10776 bytes
SHA-256: 9bf871384b319241540e641a184d228d95a00290db40e052f0204fd487ac5774
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 18020 bytes
SHA-256: 0485bee16e93ba3f682d560c3933f3baf7e9b0ed38342558ea9884c84011ced8