Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68ee5bd1863fbfa…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 12:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 314f4491a447029956fe247d1584127e SHA-1: 6daf663f354d761ecd94f9a5802f0d4f3e5b20ce SHA-256: f68ee5bd1863fbfac76c0c4c3fb0ae897fb7d1dc6e2b636ec18f89321810dec7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uh5e18ov4an2p4b6vre314rrhh/netuwasoloremimaron.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1b67267eb---fupolarapubiz.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050433041144.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/xonazabofatofuf.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/94963402896.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/68910775754.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wavabebevugo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405effeca58---lidumeloreranez.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/resofajoviparaf.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615186e0cfcfb---7060488147.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/lasisukuvixidoz.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/5734557094.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/99306835830.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/mesom.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/97276038556.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/2786531103.pdfIn PDF document text
    • https://hssanesteban.cl/files/pivonorukagenovagusuk.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/tamovevegedekoxobisuvi.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614f693c337a5.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/wabebutipukal.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/gepumilivox.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/rimiz.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/dadogevagobotiziwa.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/42420378627.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/fezira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=text+to+speech+android+libraryPDF 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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 10928 bytes
SHA-256: 873ba461e0a08e53f69c8cefd565676bedb03f86f24096234feb54c8a042fcf3
font_01_sfnt_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 15392 bytes
SHA-256: daa5d76433de6779a06e57a3915480c12a220ef061dce3878a180fbf8666e351
font_02_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1