Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb2f49467d625a9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 23:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11277f4244f09deaf3156c2a68a4b7d5 SHA-1: 6563fb8fa154e86c3bffa098b2632240fa75ebc3 SHA-256: 5cb2f49467d625a9722c68aac2a8b5a58580af1ed1b9d8933a9f02e599571662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/um8tk58pfqj4973ig85hi6o6e9/fuxurakiruposeporux.pdf In PDF document text
    • https://takitech.hu/userfiles/file/rovopulonu.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/64239022789.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/bubipiputirejovuxilew.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/33858641399.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/45101954900.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/rabomeneguxokefepebaz.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/liwoxekalu.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/rusakugaxetabewosepe.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/kurolazuzabim.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fusesidodeguwexokivip.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/zujiperebixinazurisutuze.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/94919507616.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/38880407398.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/kivilavufegosilotinur.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19791855663.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021910103785206.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/85633264319.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/wimejevatemotuvi.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/20677936883.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sabep.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/50012622926.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312733bc7e9---wapokomulodedoxe.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e62182b5769507efbdf5913755fff033/74838488680.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/9374854871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kotler+armstrong+2012PDF 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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 10644 bytes
SHA-256: 7059e54c2bcd382d2a0200dc4a996094876369a63e27211621541f98d2162413
font_01_sfnt_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 16624 bytes
SHA-256: 710052362fcf62ebec480d4442e03e33ccba29c72a8b93c2603d38d422b660d8