Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb501de8ea3ac18…

MALICIOUS

PDF

92.5 KB Created: 2021-09-05 19:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1399794e5f97724cd89f9f6a06be40f SHA-1: 750a8d7dbb2ed98b97ca70fef5a4a89d1c0f45b2 SHA-256: efb501de8ea3ac18735c5a1414c1e0eca7f22e84dd8c7300c6f0cbaf9cb7e92d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dialogueinpraxis.net/files/docs/xisapusibebusafizu.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/094dfc13ed15b3c6a69fb28d87f3bbc0/80699995354.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095a7419f0d6---fopafanobatupeletojukep.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acc97f18e81---lisopunuxivuvuramese.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16803583778.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7a53e410---midefitonugifubejibo.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/monudaganivafe.pdfIn PDF document text
    • http://strandedtattoo.net/file/gelogokazume.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123af13b8335---33149111793.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nobezawixu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3165eccf---85428824667.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7ee5ee5frgv04rcho1lco6lrjg/54587226936.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/25498824715.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f975ecd527---dilobiwupive.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f05fe45976cfd189390715ff85aa286f/4309205522.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c3fe52c75d0d0d3c63029d50f230fe80/mutiru.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qghkac3ddrdn8j4f7g3dmq9osr/jeruropetikixazidirap.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/61975392804.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/pefata.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/ranok.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/55856944865.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210516182954.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2ab55e4b138b0c5c2b1ffe5866c23229/32546713257.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2bd0448f---20142165539.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/35314059000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dictamen+de+auditoria+pdf+mexicoPDF 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_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 18888 bytes
SHA-256: 35909c407dff00512a6c7459b42e2e0c013ef3187ca0a8f985ef2317a407c9a8
font_01_sfnt_off0001333c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B53 10768 bytes
SHA-256: 1601e14075e90aac0176daef5d72bb891ca6b53cb74f3cac08bb3de9fb0af5ee