Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad829b02b167b9eb…

MALICIOUS

PDF

67.4 KB Created: 2021-10-22 20:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d846bd7cb185af6ce42194bc6e1ae85 SHA-1: ef0f8e4bd0d5118a5554286f1b7e7ecf9b3e24cb SHA-256: ad829b02b167b9eb2cf1cf7de8ef8b76fd8e5c57e7e7e972703169c13eb4bb50
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics indicates a clear intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ebus.cn/up_file/file/21585797323.pdf In PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/timomifewefunerej.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/99972802452.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/62556917564.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/9111928196.pdfIn PDF document text
    • http://thailand.metten.dk/ckfinder/userfiles/files/fupepagaj.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/39576584566.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68618c560fda8cbcd838553e8652940a/gakuwozudemimakarexu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16169986ea851d---29560911047.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/zelito.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615fcfc8527d2---7078658337.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/zebujepereve.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/99508155752.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/15819537864.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210913045126.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/towabi.pdfIn PDF document text
    • http://allier-genealogie.org/File:/dinoxudovo.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/vovilepax.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/94845023381.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcf0266bc7---75994819326.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/jabowetot.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155ec3bc5a96---93908515659.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/94552531858.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=would+you+go+toplessPDF 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_off0000adeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 10316 bytes
SHA-256: c55a712be65f183228b8946bdf6e3cd7c5bf850e5ddc31fa0fd34e405d3c6401
font_02_sfnt_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 14100 bytes
SHA-256: 77c10674b80f25dc80a3e9acb77c10495cdbddff99c0276ceba5032d53ca7651

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