Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e3780cdefba92c…

MALICIOUS

PDF

73.3 KB Created: 2021-07-05 18:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 403e5e611893eac6d87c79b9f33eebef SHA-1: 46054ae0d088cd8df428bb7b52ed331703765985 SHA-256: 50e3780cdefba92c9e06ace3f5fd41fedeffc3d2221aa10618673b340195119a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic PDF_RANDOM_URL_LINK firing suggest the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=anime+battle+arena+best+characters PDF link annotation
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501002410249308.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8f065e3db1ceff8f926c563b4b0cb859/34551125936.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/57886403084.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/teveronanijemiwovifenib.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/tikupavibujewuxeme.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/vifofotuxaguxuku.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf127b86d94---40635248316.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/sudaxiduban.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cebe365f91b59c48c316a2bc4331b3f5/85979934404.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/gibogokokebo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3bfe30bb3---47818564997.pdfIn PDF document text
    • http://domplus.su/userfiles/files/12314721358.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/91687535347.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/86e9634135ecd91e8dc5020595bfdfa8/vizixa.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624205921.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b3cb0f86aa43bc62b95577a11f7ced38/nesineke.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480a184254---30463571815.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/37505732266.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd190b1fdf---zikebenubifinumetobadovas.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/munadugenagemaxovil.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/adbeb424b66a5b1fcc266b10f43e9271/86983704472.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/dulatipemedixezetudi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ljgn59dpufig5teeoi4s3bmh1f/soworetudufalidimumusoxuv.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 16208 bytes
SHA-256: ef5b08a8adff5cb7af9ce1ae5b711406c30e93b320d08a4cde95a62e66128b10
font_01_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 10496 bytes
SHA-256: df1b4e39ae68e3c58f3a10d4eb2d366c077636efe99b0c1ee18f326b50501f16
font_02_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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