Malicious PDF — malware analysis report

Static analysis result for SHA-256 e500904092a297ae…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 05:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea23308998a7a559b438a83ce7429767 SHA-1: 5c3ab6450585d77eaf239aea03209de60942d061 SHA-256: e500904092a297ae7d872c5c1752296631f8648db81781c2559846a9e7ae7735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure suggests it may leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.recko.ru/ckfinder/userfiles/files/81691147166.pdf In PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jewegosijurekirezajeli.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc43fa0ca3---dofirewu.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/32587812067.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1561746605.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/36339387103.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/79257824587.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/74434427362.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/92131729030.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/jetivovedejedenewubunawul.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/44355665035.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/67095700222.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/saludewez.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/70641726562.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/bukipexasotovivenol.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/66292040501.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/376aa6965913b44256b9ae7a87974bf2/70367701967.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613632caeb07c---vafaziporuburujuxazodi.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/75159656719.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/36148211300.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/jezatosiwuvesem.pdfIn PDF document text
    • http://speckrepej.com/upload/file/mugetixutowave.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/3790585711.pdfIn PDF document text
    • http://sdds.be/userfiles/file/59547971540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=galaxy+s21+ultra+vs+iphone+12PDF 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_off0000bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC5 17112 bytes
SHA-256: 61f27557d0254e0e56138535a954a89107e08b17ab38ae481b5b5a63b1e66c90
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 10944 bytes
SHA-256: 805b243ec114b5dc518014720ce75428830d9056ad21c4e76bbab9d19b14c304
font_02_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1