Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b1e3c9c658d3c8…

MALICIOUS

PDF

82.2 KB Created: 2021-07-27 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 93f7f76cfceadb8428d3b91809629000 SHA-1: 5231a53e0932859311c6993b466ec06be662ff46 SHA-256: d3b1e3c9c658d3c8d1a8b6335d79b7f19ed1d844488cc907d3ab1233c75f07ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or serves a malicious purpose. The presence of numerous links, many pointing to compromised CMS uploads and disposable hosting, suggests it functions as a link farm. This pattern is often used to manipulate search engine rankings or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kojeneckezbozi.eu/userfiles/file/gerapevajefavetejegokilu.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/55bb7799215b40a3616564c65faa9385/26200675846.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/56328155959.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/44754785968.pdfIn PDF document text
    • https://123natura.com/stockages/files/kivufiwixikiwigosi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6107284393793783dfc8008c025284de/jawetopofoka.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb3e83dc9---dosesojuwumalakawobirom.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/5763716700.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/zutokipib.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/23960dbab350d51d58384f67091b6561/20204051677.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/sozobasirugew.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/jewakidolujapitelo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cade51e---43451819224.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c184ef3d---vipojupajifikapizawuza.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///92713849445.pdfIn PDF document text
    • http://specimport.by/files/files/33099235180.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/jomuvudurubex.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/wavukisavesogaxigem.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/dixul.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/26268155782.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/xaxogoputemajibujugoxusu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609172279dcd4---nitoxonemazulenej.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/70768469643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ver+cinecanal+en+vivo+online+gratis+argentinaPDF 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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 17496 bytes
SHA-256: e69cd4841f31e55fe88ab64674afc411d86e345da87db1b3862be91377006b26
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10440 bytes
SHA-256: 3d38b2041053f20c84299f0a9d4c645edae2ed169c28afd3cf2f887189956f83
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1