Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5047ed31b05f57…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 08:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbb4f0035832fead870982e8c2a93f2f SHA-1: ab55d0042afb525b2926b5a6b3f5b99ec8e38edb SHA-256: 2b5047ed31b05f57429b77304adcc8d061906ddadf9e55b05c84fbd3d0eba8b6
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://autohondl.cz/userfiles/file/fetol.pdf In PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/69c3c4e83b2c42fd8deb792a2b579bf9/51086746864.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4fa0e1334865fd42178d6e60910e2e46/30266516833.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aaa8491b75---pekaxedenizaz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a42ie7l9v06c906bsid7a19651/divufipejalata.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/98396856733.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/72105721888.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe88631303a---luvofiwotopaboxa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2248fb075d6edd20e6bc421ee2b40d0c/wozivuvukoborulerudopok.pdfIn PDF document text
    • http://asvpp.fr/pdf/sitibagi.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/92379777201.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/mozujudozakixejijik.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/lovitegifolijebowav.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/86851379030.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/1011016156.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fea0f333---lamepebuwutejima.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefdc46f84---dogekalezujera.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47cee270b---vawiradalitiwozukemumitog.pdfIn PDF document text
    • http://konberdbio.com/upload/files/rijexesifozumibukodalorab.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zijapawexutefilakafewo.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/4576425384.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/47392346561.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16111a356c26d8---4782789681.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/navepemizivapefizin.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/filige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2011+volkswagen+cc+sport+owners+manual+pdfPDF 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_off0000be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE51 11412 bytes
SHA-256: d5ae123462a7accbb1be98959f1dcefc45922c37d1be9d7c1199ebb459c231b9
font_01_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 17232 bytes
SHA-256: 194f40c34d58ef66d878e713f62925b947e89e8ad9d2096e8fb4b02ff6d8ef97
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1