Malicious PDF — malware analysis report

Static analysis result for SHA-256 297f213b68a81821…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 23:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7daebf953e6092accaaacd1931208ff3 SHA-1: e85830b247da920e41738e76545fe6ce6f1c4c21 SHA-256: 297f213b68a8182191234d5375cd335fc29f0fe3b7366ea0ec65c2afa1fee693
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various websites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://inwebjor.ru/uplcv?utm_term=mod+menu+2020+avakin+life PDF link annotation
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/puxemelitopawamimonug.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309330ee18e---kamevasarexafiwotujajo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d7632752d---8689918888.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/42336468529.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/pumekutorowe.pdfIn PDF document text
    • http://aurora-c.jp/files/files/27219101969.pdfIn PDF document text
    • http://identik.hu/editor_up/gadusedopelujakirodi.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/xexawed.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/26586403060.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/tafinobawuxukarev.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kujorewifi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n014eqv5qpe4cqt019palmdmfp/monuxunuxijitaf.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/16169954332.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wezafewo.pdfIn PDF document text
    • https://atlantidegattico.it/file/bojekunarajefajuno.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/suzuforuz.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/vowamukaz.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/91227559115.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/kizixavenelemagepupor.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/18538529201.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/12149448722.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/37574406193.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/24t0mo0fgavlofebidb6frvna3/suguzuvinojewonogem.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fudaminid.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nenobolinibopireju.pdfIn PDF document text
    • 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_off0000c169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC169 16776 bytes
SHA-256: a0bccbd9ee336726f0c327553d96416b59d0cd7e44992b6045ac70283fc6bcd4
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 10640 bytes
SHA-256: 53c5a43041e95bf352ab347ad215ef21232a8880782280ab47be41873be3a53b