Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d6f1440de05a37…

MALICIOUS

PDF

90.6 KB Created: 2021-07-13 07:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5427dd251b8feaa263bd284d53bf934e SHA-1: ffe5e66ae4a0da9a5d36ea7f1915c7371a55469b SHA-256: f8d6f1440de05a37a62b37438e86d46831cdf63b0146af3a14a2b5c523fe8a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to lead victims to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87df896ae---4986643787.pdf In PDF document text
    • https://big-affaires.com/img/pics/files/59582701617.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/14387315094.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/lelubasumumijazivomezij.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/funejovakodujutovake.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c1077ae1f699e973ee67ebc927f6a200/xomawirisewawip.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/ponaluzaxozadudib.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d76b2e92c5a6e479671c84d6a5bd1baa/satuxijimozewo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210707172644152957brxvth.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/08fas1qokhtq7cehf9d16qnfpp/pafuvukuverali.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/roxavat.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qk94qgm3pfeog83h2vn69793c6/sobutinopeduvezokaxako.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160815e8c2b1e7---vojajasowa.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vvau7dtju83q710uuhprghshm1/70426584507.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/58426065938.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ced3f2b98072abd91e430f8d4840870/36366307722.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zanibofaxegugunozemuk.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9e68080d6605e0aca87e1ede40c118e7/59315375124.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10b89425---feluzodakofa.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5e315fcec5d636d1dc7ea8796a4d0559/66326913236.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4c3aac36f7ce7f894958a1d78f2685ec/gijarid.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/70625857399.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ru1doffkgkc8pgrh7q2ecpdaq/buguvegidoxasabovuvibe.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607090c7befcc---27668032161.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c285e75e323---dipaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nervous+system+lecture+notesPDF 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_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 16976 bytes
SHA-256: e6bea5dd1f8f0b273f5e6e1df5b171f7543cbf49e45b95476c9481cf33901824
font_02_sfnt_off0001439e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439E 10392 bytes
SHA-256: c63fce77c77d340c94abbd141c2a4610bc6dd6cba37a5c06a37cb3cc44678d42