Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5c539367f17ebc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 03:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08225480ca72e64256253a048d9a708c SHA-1: 0803d76ea3fbe62d588a761a4c2f8f0166202bcf SHA-256: de5c539367f17ebcf46bd3f647c8753673106c393e3d02bc74d585f02d0735f6
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or visit malicious sites. The presence of a 'download' button heuristic further supports this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9bf6aeef1ed5b580b1be51b7bdf61946/binasodivewojazexotevute.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160954e8b3f2bd---19603990466.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/22250498085.pdfIn PDF document text
    • https://visualarchive.bg/files/davexidel.pdfIn PDF document text
    • http://bptramptour.pl/files/file/buronavagagitodupapezop.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/xipovabinapek.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/69bf5c126fd78b393149dcae525e8abf/lodanefukazukifugozije.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/50790765206.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/8540885388.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/zijelabajanupabipuwo.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/vizodumolodega.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/72389241180.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/goxunonunorazifuziro.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ke1uk1g0ptpgnasr1kf6fkrrvl/dorejib.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/jejulip.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/20318601561.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/87898276469.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wibopawuzokitiremodofero.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da825b63d---dejukifumegugibu.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/fetoxasuwakeginoz.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/joxogifuxulawo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/76f9e11d1b7aded1721c5030757fe007/pawojajasifutamexexope.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b27a205ee373d956923f59d80192488d/sigibonarelod.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/de0fc4cd69661dc6a7953e285b0ec7ab/jareluwo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bb6bbc061044465ededdf6879999b0a2/gukuregelulejuw.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/77982444055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=present+simple+vs+present+continuous+worksheets+intermediatePDF 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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 11124 bytes
SHA-256: 217439ce73661071098ad5f23efcfb770c3a5eb13f2fe76a18ccfa19cfe5aece
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 18064 bytes
SHA-256: 7ef5d60e220f43c62c50c76e8c31a72c8bfada63f7017fd6a811249bc271daf0