Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f24e2996edc6c5…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 09:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2f909b3569965b5f26b7a6cb1cff033 SHA-1: 0729998eb96e80ec140cee6bf3e0a054a81b1e17 SHA-256: 03f24e2996edc6c5f74659a945afb3108c4e43333a3306bb4fecf544310f6574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with lures for downloading malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=one+hundred+years+of+solitude+free+pdf PDF link annotation
    • https://sysyanginguvenlik.com/uploads/files/wowavexigewubafakimon.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614293b249ebe---55121763444.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/gogunelodumivizoduxazeva.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_AD6AE38C8F8E6470.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_17_17_30_14_7181.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vomegapojusudedetileno.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/18507192818.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/xekabejak.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/68439291439.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/bukorizetozafinazixivosux.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/43938f2c20b9a9b95ecb1042c24f8497/rusamobovuf.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/41544345747.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/96874591218.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/nibowut.pdfIn PDF document text
    • https://uangraja.com/contents/files/zexowumipo.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dusamof.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/49692357141.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/rozizefomumiriru.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/wipojuxuvowonumagixifepub.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/muduzarepisanoja.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/9886002482.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/55011627009.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566216ee7a---pamuvepuken.pdfIn PDF document text
    • https://limsurempat.com/contents/files/82217395407.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/sinerasafoj.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_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 20376 bytes
SHA-256: e20ceda1cd8c97ecb39f8acd216c50c0594e33c9891603e2b163d04e06f33013
font_01_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 10836 bytes
SHA-256: a532a7e1e3b5a0b70042526ac323356b90b1f16edfbcc5c31d05d7f2bf6dec6b
font_02_sfnt_off00013791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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