Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdb5cbd94fc629a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 16:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cf63f9dfb81f9512114549981aa2697 SHA-1: a4964a1014b43414c747e65cdab26f29a3a538ea SHA-256: acdb5cbd94fc629a2a9ce097ffb39317dfd0a34aaa19ca13731ae16973d82ba2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l63iv30jdai74o96eil2btjdof/51276404507.pdf In PDF document text
    • http://surtek.biz/image/files/20150127_054330.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b400933a7---tadipot.pdfIn PDF document text
    • http://armanetti.com/images/41739985202.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc36dbdbc---27760515451.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/6918606896.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612742a2803ec---xunalab.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/22921078112.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/suzelazo.pdfIn PDF document text
    • http://www.pvvc.cz/files/gotux.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/91756176962.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/tarutukufofawatubusezudu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/26698495912.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b1586b9eb33228f61e11b0329cfe3142/34836197179.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/firuzos.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/76926970516.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/35227fb7bdb05fb72eec85e86063adc6/titokeguxifaruzak.pdfIn PDF document text
    • http://sushi-belovo.ru/files/1859368371.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/rutitu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88fbcec4f8---48615977027.pdfIn PDF document text
    • http://shosholoza.de/file/67944434726.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f19440c15a2c68946090df6535172e00/71140435806.pdfIn PDF document text
    • http://grandfiltr.com/files/file/kemowapojozijibupep.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4fd6b5351---puxamud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=parent+teacher+conference+documentation+form+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_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 10772 bytes
SHA-256: 5a064cf8e9d8b631fafaf14c7d04fd4902690a3deeb1a41b5ac301fd6dadc1ae
font_02_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 17044 bytes
SHA-256: ea313be4262b64360d0d4112c20b6e0237b92c8cb9f2c605cdd82f65e89901dd

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