Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7a8fcd2024aed5…

MALICIOUS

PDF

108.5 KB Created: 2021-06-25 16:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 381880c7aa5b6ae0f6bf4e94fd467616 SHA-1: a34ee3b4b4db9743ddeac9fb1d92403bd028711c SHA-256: 0d7a8fcd2024aed56fede516a79117d99b0dbc751083c7f7134b73fcadce1e03
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=abstract+and+introduction PDF link annotation
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/451c25cb47a8c05745fe161f842b17ba/nixafulitojopamujaje.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/sigujunidub.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cf636607---40457686308.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b075c280dc9---81361744949.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/b4p1mq3p06hs6b5mit7lg9f59b/49600357746.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ae2f31368966450371453109024cc222/kekoviramuxedavar.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e25339cf93c6d587eb081b7fee3783cb/11548162516.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58189282349.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/devoxamozipaselodetalofu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/pdphn9vr177u4fv9dtbc48i1a6/luleruwodalagonisiwaxakin.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608642292dc18---fuzomixarizonivivivap.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/76575205271.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d0977c8c---48500358320.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/jasoduxowejanigiru.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/800e705a8228d0aca869477d1c88b705/kugubinidarug.pdfIn PDF document text
    • http://gtshotel.it/images/file/tegutepadagafurix.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxenixigegavexosaxedan.pdfIn PDF document text
    • http://holzbau-napetschnig.at/40632872015.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_off00014872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14872 17172 bytes
SHA-256: 7f911784ae86cd13e8f5afbbfbaaae3209acc441459a4a1e666ab0e03cdff5cf
font_01_sfnt_off00017565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7C 10408 bytes
SHA-256: ad8e48824d54a291b33da1097c21a99c6fd78dff6afc8e4493de4da083e334c9