Malicious PDF — malware analysis report

Static analysis result for SHA-256 92597fa55e832850…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 00:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ec615d24733eeabceed1ec8ceae4efb SHA-1: 879f48191bcbd6e00d8b389296ad947adf3e47ae SHA-256: 92597fa55e8328504d10dd04dfd4db57deda64b9b4fd3b77307e6f2d9d729b50
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://crewmak.ru/uplcv?utm_term=dev+c%2B%2B+for+android+free+download PDF link annotation
    • http://revucue.com/ckfinder/userfiles/files/67688277117.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kafafujegarutebi.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zorevepepepuduwu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4aiep9gvvi8d591d1ha18lt842/jabisawonunobizij.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5b54c77e8---62985342472.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/54035664053.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/56789928058.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/mojejujosirede.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://naturallabs.fr/userfiles/file/38805210582.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/faporunidukiguwaned.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/duxij.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/8423060414.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/zufimobalemovowakedota.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagorazakexosivatuxarak.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/vigidudanobatugadofikub.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///fomegubifujaxiboko.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/rofetokitijobogise.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/tuwomademeguwedagimi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1e4ea3b8---kebomiwox.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/63486155745.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///61661235706.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/xowudalipu.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/kuduz.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/61249192227.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3e5bdfc29---46235581246.pdfIn PDF document text
    • 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_off0000b528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB528 17608 bytes
SHA-256: 35a63ddc49dcad016950481bae991440b1aabd4489c5edbb379392bbce84d79c
font_01_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10356 bytes
SHA-256: 8f87ee183dcdc20e8773e63aeea004b7d12dd585158145e82f24cceb147c6f06

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