Malicious PDF — malware analysis report

Static analysis result for SHA-256 c278120e193b3e5e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 10:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b36e75234a49b71c63db891329744ee4 SHA-1: f7bf23c332366e84719ea3437518bfe1be47487a SHA-256: c278120e193b3e5e37409f7abd157342f99bc692e9a6187b77e2dd755f7ed495
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://cesishotel.lv/res/wysiwyg/file/12448498963.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nvt98v4a8eqmgvhentpqoql36m/13712439253.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/165907e1b8c531e6a03e865e24a9ca38/kojafanatu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f94f2534---29389684136.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/vakuzu.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/vororomelokigiwo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f2b7afe5565de32d52e0ff4ffd6631fb/ladom.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021070304510670554.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/65345548772.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/lezezaruvekurubujosatupa.pdfIn PDF document text
    • http://askort.pl/Upload/file/42696315182.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/peluradoboxepi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabeb488f5---78489502414.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd7e4cf37---sinafupilinitub.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/51718542168.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sanazevifizex.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6065835df---27799580132.pdfIn PDF document text
    • https://zhansq.cn/upload/file/4509257262.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fivsf9gj889h9ipdbch4k0dhqo/81378058057.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/10433440551.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a76823e59dd---jafebe.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9684f2a06---boletedafisatu.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/wuwerepiwawolesuwere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=adlerian+lifestyle+assessment+questionnaire+pdfPDF 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_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 11000 bytes
SHA-256: 4cd0ea77fe6a613e8ea5a4b3f0423cbd1d9743ce311ac24cc78a2a95b6f1717f
font_02_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 17076 bytes
SHA-256: ce9ed772cbe3d7d576b0678fad669f5cc265736cde63913bef34b07718a64ff8

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