Malicious PDF — malware analysis report

Static analysis result for SHA-256 d285c2d50e7d3303…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 04:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe4416126c4565efc2c4a9db44d824bc SHA-1: a7fa9dea4ca05364ec11520c7cd6819d043f660a SHA-256: d285c2d50e7d3303c9c398b6f3c690c63f9ea4177e4b7bbc90c2a102fbdde346
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads 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 malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://scamps.biz/userfiles/file/72465363828.pdf In PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xepuv.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/99376161622.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/zijuw.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/63479996910.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/refatagafinevigabu.pdfIn PDF document text
    • http://krupongs.com/images/file/89454634437.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/87927218711.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/27525183392.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/72017401741.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/22028261108.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/20052422052.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32315992413.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/fuborawu.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/38348169208.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/koluv.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9f6b1fea---rufedumugotejivogiziduzew.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136025571963---43951936032.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/toranuwadepipiwaxoniz.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/3464558932.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/48364192542.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r6jlh2tilch7q1koqofe9no3up/12327148772.pdfIn PDF document text
    • http://salespate.com/userfiles/file/27954943103.pdfIn PDF document text
    • http://herve-coiffure.ci/files/lalukejivunanatutenaxeg.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135281c8fe97---wipogaparajibobaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gaana+app+apkPDF 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_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 18708 bytes
SHA-256: 8b00b2e04d137b2465bf1bbfe4072fc2a039d4e0ab54dc3bba492b8a24bc2626
font_01_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 9620 bytes
SHA-256: 12cdd8e57aa6af618e0ecca04c5ac3e6084416ce7cf035a6900d19e4813ef85d
font_02_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1