Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9823b92cb985a6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 13:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1322c8983278fe025b9b37fb2371c82 SHA-1: ad734896ae4206673b5828a1d1735e6001c88b2d SHA-256: ec9823b92cb985a6ab9e30a19395abe9bbd10733076fcd5178beb46617693c1c
196 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The document contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. Notably, a heuristic firing indicates the document instructs the user to disable security software, a common tactic to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://oniceh.ru/uplcv?utm_term=aimbot+fortnite+free PDF link annotation
    • http://yaqeen-eg.com/userfiles/file/xalibadonigekatipazez.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e8b07134---38472733630.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134888a5d74f---zefizovatuturat.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/juroki.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/25535291348.pdfIn PDF document text
    • http://fkhd.cz/data/img/mofeziwinatuvu.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/bagepemexuxipalaboma.pdfIn PDF document text
    • http://oodow.cn/upload/file/210918155608985540xiu71m78lg3j.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/refivebifoxotinosaxa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161401b21bbc46---totekovujej.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/5224175327.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/18698833068.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/13018427233.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/18071915314.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/17090374930.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/golapikikananusexekod.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/87499173428.pdfIn PDF document text
    • http://www.puhito.hu/uploads/kilimujomenazuranajuru.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/vapezejaner.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/lomugubefekawi.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/46518396733.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/8919860254.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/kagagexu.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/74399180144.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_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 17892 bytes
SHA-256: 288433bf02060fdb784c70b64ae94fd06f4ef3ddb34a45aa537bda878d7d2d9e
font_01_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 10120 bytes
SHA-256: 4557b8bcda6bbfdb12dc40b0de3d9af3de01817375b4a9d4ab427498521e4690
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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