Malicious PDF — malware analysis report

Static analysis result for SHA-256 def9e62d482a338f…

MALICIOUS

PDF

83.1 KB Created: 2021-07-13 22:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7eea381ce9e894ac3b91bf9162d036f1 SHA-1: a3e60654ff25a1733ec1ca490e94f0ec8b384aca SHA-256: def9e62d482a338f347a9efd516d1a771f9be412df3a40bdf9ff8153888825c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting the PDF functions as a link farm. The presence of these links indicates an attempt to lure users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=quality+management+systems+pdf PDF link annotation
    • http://katachizu.com/img/news/files/xurof.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6dd1a168c0e56fc3624d469a2cc15cb4/wojajobabigexupib.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f83ad5233---xetuleta.pdfIn PDF document text
    • https://zhansq.cn/upload/file/13076361653.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/69303132912.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/titoduvosodizofaka.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/foxafilujorel.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1abab9fa1---59029952146.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358f6e0fe1---dezazodilijatufek.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3d5fe7f88a0b1263df64d440942d79b/fijipamujixajodalapetume.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/daxorosibefega.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a0310f7b---90233854723.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/fuziven.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6ab8552b85ff20cf16866e9624a43df7/lonokaranexoma.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f69f398f1---zofosol.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/30633941590.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/tulutoputixekafogeten.pdfIn PDF document text
    • http://mosjob.ru/images/file/60746477325.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/11408699698.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/gavafasuvidipurugefusu.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/keloponetemut.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/da68e27dfc1acd7d1fdcc6cf9d674b3d/rigozekasimizupete.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 16824 bytes
SHA-256: 7082a361013fc672f2dbe88aa1cb3034365c7dc88d49e62f4d14de542aedf73d
font_02_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 10892 bytes
SHA-256: a61556a440a235f8733d2eef153be2b49c4c0a0fec41fa60989c423aa33f5dfb

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