Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0870b5a6a2827a4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfa94d18cb09cd3327517ec4b0f9868c SHA-1: d1bf730452959d2eaae5466eb72a3a96cd8f27fb SHA-256: f0870b5a6a2827a4c902b0c0cdb1c588f663ee6d083a11c3d842ccf911dbd5d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82928622471.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc9b1c308---1535409327.pdfIn PDF document text
    • https://hssanesteban.cl/files/30364415451.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8cfcd0bf---powepixefumoxusajo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/52648336985.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fleqagfvp1pa1q0rj8t81phjui/28547570591.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xaxenofopavojalasoja.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ac1447adde2215831203f0672ecb7836/revedopipedabitizafil.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a067b97537---jelitukanifulifuvupav.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105050617025170.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/zugaraletobaxulaxos.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/37054416231.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/liresepuk.pdfIn PDF document text
    • https://slide-bearing.com/d/files/jemumebumojosamapavigu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bojav.pdfIn PDF document text
    • http://fotoprint.lv/downloads/file/2813155004.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/91624590077.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/88950875908.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/53996842110.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/86869856915.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/21953150633.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7cdgfat2rpefs6qd0h91k8f9q7/93910346059.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/brp5qjhft6hknq01064ai8h9l1/mititasales.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606d821ac55ba---11635031873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tipos+de+prueba+de+esfuerzo+pdfPDF 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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 18312 bytes
SHA-256: 44d1cfcae869a4f69defde76cb8200cfc813c3c760aa0475bd065c09100f536c
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10504 bytes
SHA-256: 5cd6a79fb182fa44595a215ac99766997e0bdc7039dbe9b92c74d04ee0f49553
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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