Malicious PDF — malware analysis report

Static analysis result for SHA-256 53469ec122111755…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 19:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09acc4f8d8666af58681167f39d013c1 SHA-1: 493501581a5ea88e1ac60d00edb3fda890e4e302 SHA-256: 53469ec12211175549ae2ea9c466ee96a814deb6f538d835a42428dcdeab34bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sgd42.ru/userfiles/file/65230775485.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c156a78d8e99c801b519a2e24773744b/93923313223.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/269b2871baa04e8aa88b235e6190e2ce/31109807847.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sazurupevejisesu.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/68965433128.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608289ce3018b---80093209000.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/muratizatusoladuram.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105add556731---35604982679.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/besorusajidixupasulek.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/97697771182.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc16de7929---tokebekipomoguvizutawid.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/7205734650.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/gelubezeruxanogoluge.pdfIn PDF document text
    • https://curvy.tw/upload/files/21759757629.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/55754440851.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/26469125525.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/35547980822.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd280f9f4---datunozorowoxob.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/buwavasirezilo.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/vipezavejosisogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mcsa+windows+server+2016+free+pdf+study+guidePDF 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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 11572 bytes
SHA-256: 983cbdefbbf13492adf11ad87e45eb09af20ed741c960b7eefa2b64c0a46f1da
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 17544 bytes
SHA-256: e799595e5b399be60a2d1caf303efef0f3c4380b3ea581a549417d4bf2a691cb
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1