Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea55f7637d83e32a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 16:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 984ff93660444bf670aaf218b9764ab4 SHA-1: 148ddf03371500396ba6c9920c8f4ddc74b9c852 SHA-256: ea55f7637d83e32a26103b10e7df0c2d91010cb4c9ebe4140996484fe098b79b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and compromised upload links suggests the file's primary purpose is to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alteanetworks.fr/img/file/84518251901.pdf In PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/7492592647.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c47765f4c---difolakivopitolidudi.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/38731370399.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/9596530256.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqcl8gq9p9rftolic3bn7gk6s5/lumezeloz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613927ddbdd7f---pejimikokapar.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/wonon.pdfIn PDF document text
    • http://benetalent.com/upload/files/webasu.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/13123689125.pdfIn PDF document text
    • http://fourfoods.com/images/files/xadidakusitijotas.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144569674ebd---balimodisuwepu.pdfIn PDF document text
    • http://berbun.com/user_img/file/wasupojolexot.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/33152599040.pdfIn PDF document text
    • https://mangallagn.com/images/file/77071026793.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/28838172983.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/10572196416.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2cd35772519759718d2c7e9cd6cbcb63/28321718035.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210913_CC1B4DBB95F41CF3.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe440bccf---jivavebuzuzunalikaf.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/togiwivodiko.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vojirizonogonos.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/94326616175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mientras+te+olvido+pdf+gratisPDF 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_off0000bc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC27 10732 bytes
SHA-256: cef73d8170084649eb086cfbb777fb9dc57149f206ed3e3d06174b93872ce729
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 18744 bytes
SHA-256: 2ce4f3dc991855c9faf505425bbfd1186a697b706c64a7c223091a024f007299
font_02_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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