Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d240a31195a9b5…

MALICIOUS

PDF

96.9 KB Created: 2021-06-25 21:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7efa3b3545d7e049c746adb77654888 SHA-1: 86aa628f797ee4e638c802cf73db59f234777803 SHA-256: 83d240a31195a9b5314b5e2a822846a246e6c3c21f2780bc61d78d82ae4bc2a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF itself contains no readable content, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/jshj1dlj7dnibg8bv618t3g7p7/90432430752.pdf In PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/27410460643.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c797055ba7d---34653076187.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774d9e47e83---tewupavabeferojelisi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6676fa54---29992836694.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c7f8f75e---94712441409.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721ed5dfd0---kejimepemalepi.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C6315266561.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/up7g7gitdcq9khheqca5tc4343/8930532947.pdfIn PDF document text
    • https://estoniapools.com/contents//files/motiwojukuzonaniw.pdfIn PDF document text
    • http://metapolar.hu/tmp/60433637655.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cfc65405---94688162530.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nidibonuralupi.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/pumakajofedijux.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d988e59902---51550038897.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2a6e1e06---64152691680.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210524/file/16218638425113.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5584b8e11---99831988623.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/venetukoworanok.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0c4bb45405d8fd8d231ef8b29a43dd8a/22823483288.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/22378381876.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/pebejezobojafagipev.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e6a98732---vafekuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wh+questions+with+tamil+meaningPDF 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_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E4 10780 bytes
SHA-256: 8611fc83d5d70ce5657aef4ab9ad94a20ac47e7398f4246648ce21076ed7e91b
font_02_sfnt_off00015248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15248 14496 bytes
SHA-256: a254acdf6bb5fcc5fee1a5b5baf488c6536cb92767133b62471cc2fb4f0a0c88

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