Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8efe2a89b4235f0…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 20:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6b6fc8d056b860c9fb496f77f1626fd SHA-1: 9b5bc004f41e0637e71c9bf44f3c056662ca84dc SHA-256: c8efe2a89b4235f0a27992a69603df75a77a5d51a47de729f164db004455d383
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple external URIs, including links to compromised CMS upload storage and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://angerdress.store/ckfinder/userfiles/files/26097137196.pdf In PDF document text
    • http://csc-020.com/userfiles/file/20210821011750_eidmdh.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfa4a71b0---6886364238.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14943037405.pdfIn PDF document text
    • https://paperland.bg/uploads/file/15694526874.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9639fc24271ce9d0886250c04cec6cf5/kepitoliwuguka.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/24159980079.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/wemuxov.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/gubarotupalulareronewe.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6igbcm39t50j3eaq1apijmb0cb/1381491704.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/dagitiru.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9684db7a9383b8ce9d7f2806075621ec/kamepij.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d31710dd4---bawadelola.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c133a0c6b83---6338868615.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/92126946252.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/8717598836.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/53084429717.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/16617383802.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/75712036d40e826c7ff9d27bee69d235/waruberofebuxan.pdfIn PDF document text
    • http://moristas.com/userfiles/files/kubolodox.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/sexaka.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/juruwajovone.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/81888120352.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/tagivila.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/vofekenodajixeliga.pdfIn PDF document text
    • http://vladekoservis.ru/files/35581693243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=target+black+friday+ad+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_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 10712 bytes
SHA-256: d1538680a23261de8f15c4bb838646253314bd4971794cb602af3a3e43af3cd2
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 18248 bytes
SHA-256: 8807337632736d3208317ff47760e11f715e29d7825629f0b007163c907c05cd