Malicious PDF — malware analysis report

Static analysis result for SHA-256 c694bc8ee8dcda16…

MALICIOUS

PDF

80.0 KB Created: 2021-08-27 02:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9db7ba8b8f190c11da565bb3b2191a48 SHA-1: 5a093203494882d2ceb62f72bed69313760426dc SHA-256: c694bc8ee8dcda16dbf5e1b1237cc91ab69c95e049af28ea9fead6b89f042078
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 a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, likely to distribute further malware or conduct phishing. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://arendic.cl/files/sozulasovavemapapipuburo.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c19152014b7---kagobigat.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/gekilobelugadumeje.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16106293f806dc---50071915705.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/bemudalifovalute.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/52642974790.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4632c7bce8---61172328426.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5ada242f159c3590a215beaacc332c5c/17869643711.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/11659120745.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/vojuli.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d92bfc28215---vibebilefonisekik.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9e76ecf61---kasaxadiwas.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/30953433248.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/84174870471.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/84973310668.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e74be0fbff---48672122247.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jha4m59d1tacp4d4rlm328bo5u/84759098935.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/14604597489.pdfIn PDF document text
    • https://bem-sa.com/img/file/357572237.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/negaxawoxitavewofogifukor.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/2hm3uuvsa1adfk8cd8pe3hsg7c/gudivekubifatasal.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844cc18313---95511820363.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/9190711270.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b293421f75e---texupaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=picture+for+creative+writing+for+class+4PDF 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_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 10840 bytes
SHA-256: 304119a549f8df1888eda9dc53b7036f07f8bdb15459d5577cd61f1c549aa1bb
font_02_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16328 bytes
SHA-256: 52f1953af9ff197a0a249029f0cb5d850821d45393755847d6748342fe4a7f61