Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c9a543d736f0a6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 13:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 374dc1952f4c3d7126a6298a3d6f34f4 SHA-1: 97575cc245e9435e7f4bb0021f0892ac54dfd53a SHA-256: 62c9a543d736f0a6a26c496ebbc507be0481e3eb658b345d77b61a2c9662bb5e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ausztriasi.spawellness.hu/upload/hirlevel/files/3960167852.pdf In PDF document text
    • http://dar-tom.pl/userfiles/file/movekoxag.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/89659868523.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/30331674437.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/nogafowubefazasuri.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3afea912c9e3d7da03b196d65871986b/zamiwurekavisetomokuj.pdfIn PDF document text
    • http://villkasz.hu/editor_up/rexugipokaga.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/webonijijabizikutapirib.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/72861161241.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a3269f51b---65454572137.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342afe53c5c---lavuxeko.pdfIn PDF document text
    • http://dsagco.com/Upload/file/67194713589.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/zuvux.pdfIn PDF document text
    • https://chineseclothingonline.com/File/tufijanigirabagoxusupawa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161309ed88ad16---pisasuma.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/36854970472.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/patovajonujebe.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/13477851154.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/48220490493.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/96876352679.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/30797842637.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/5493968138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sistemas+electronicos+de+comunicaciones+frenzel+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_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 18900 bytes
SHA-256: 2449bd566126c9322572491009b0533e7fff4c009cf53e2d541d14538ae3ed0c
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 11016 bytes
SHA-256: e9376f2e37e7a6fd41a6d476b21764958d35a9c3d6a6ef79358b4a4e77fe92b5
font_02_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1