Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc42e6c5b480889…

MALICIOUS

PDF

71.5 KB Created: 2021-10-04 02:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8a4a7127763650b37e679ba90525356a SHA-1: 12787dc46acb99982a727fc4b4da10b07148407e SHA-256: 9dc42e6c5b4808896e14b30165db6eaf35d30a62d32eb235ec5a8158126d92d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple external URLs, with several hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://przedszkolenisko.pl/userfiles/file/55082739025.pdf In PDF document text
    • https://futurefacesmiami.com/uploads/file/loxewazitapulazulekadoge.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ec68498646e29cd6414b4c01c6eb51d3/42074786593.pdfIn PDF document text
    • http://jonellchem.com/upload/files/numati.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/885a26f1889e1e47b6d52fdf8e3e2f6b/99884694527.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/kikavogawuzagefovepilaso.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/90119440559.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/39816434791.pdfIn PDF document text
    • https://greenways.at/userfiles/file/43617505150.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/60617059980.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/lokosogut.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/47614762056.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109010309336056.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kesozozorejag.pdfIn PDF document text
    • https://majubesar.org/contents/files/66177625283.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b46539f29---6453248235.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/80595821806.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/77985481850.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/40136539182.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/linuxa.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210926084910.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/zamafizovano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+many+cups+is+33.8+ozPDF 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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 10956 bytes
SHA-256: c2e65e335cfccff2768e276372f96526ee2739f8c342cb4da322cc046c667379
font_02_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 17280 bytes
SHA-256: e6199cff4ab77a1b05e7e29cb86586c0c802c2979dd9d5dfd58274437b5d594e