Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dc1afd0c2885b6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 22:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6604a1e446f810f5848ffc3b416b8042 SHA-1: 1e34c74329acc3ebd04ca4e1114222bed200e6d5 SHA-256: 54dc1afd0c2885b6ff646f89c0b7b340a8ae674c2a6f452aa2f2dda5af90ac68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beastyenergy.com/userfiles/file/17827778079.pdf In PDF document text
    • https://moulindelarroque.com/userfiles/file/89014158917.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/99223593743.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/ginuzuwajinomizedusuzod.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/65296828316.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/32710155547.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/18a5fa9hh3eh5hingaplijbkvf/6438372623.pdfIn PDF document text
    • https://actorconseil.com/files/file/95513324226.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/44964226545.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///70228797470.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/12585962345.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/dadidi.pdfIn PDF document text
    • https://jurad.eu/files/file/2603641788.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xebumobigewapupewiz.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/tinesafurosagolu.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/bigusavasogakuxaj.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pokarigiju.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/banatudavapux.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/20329358207.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/83111290575.pdfIn PDF document text
    • https://0900107678.com/upload/file/30591376462.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/53696891969.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613270b0be8bf---gozuzif.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/84595898983.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210901053129.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7ef58926---31581180385.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead9a9147c---82601116344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=moto+z+play+romPDF 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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 16060 bytes
SHA-256: 50b9aee091067e8b467e2d5c0c06dc52e64cc240ff18115e77c54be1ca136ea1
font_01_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 10084 bytes
SHA-256: 30b08aee32ba55ff4c9f21770919f022ac520ab4d268609b622be6d0b1025291
font_02_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1