Malicious PDF — malware analysis report

Static analysis result for SHA-256 776567ea75d36ef8…

MALICIOUS

PDF

114.7 KB Created: 2021-09-07 10:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89f19f72a5958d2ae753b55a87e7293d SHA-1: 90f97502ae0003acc89fc44a0c1b9862f9028e0e SHA-256: 776567ea75d36ef80a2b80fe3e87b19196198b1c971301fe70f3190d1c088afe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://kirmatas.com/userfiles/file/88931954449.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16486941e4---18071270472.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/588485458.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/70313186184.pdfIn PDF document text
    • http://ruresept.ru/files/file/gurixokafibuzixasu.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/tobifoboguwuviwede.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/39745792113.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/xepoxi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/51736322908.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/77e9fabb4d3af18dd876d213fac25567/najija.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210826161957.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/73673468421.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7143b221d---5221378771.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jajakufatatag.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/49688337343.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/69276416833.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/18298878445.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/jijinifalekukojafisudokat.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2a0385e9ed8ff271646a23698b063703/2525674765.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/759675aa2eaf60181502bde63010b58a/lijigotudexe.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/97722959598.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/91626660781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=feminist+therapy+techniques+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_off00015c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C04 11056 bytes
SHA-256: 60e97dcecb2796fd3a6fb5e430d21200e29fbdaabf9c083992fdd87becc3640a
font_01_sfnt_off0001755a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1755A 18392 bytes
SHA-256: 180da22d7d2440e0553b517eabf0108efcb0517086b5100e524a521e2c7a9481
font_02_sfnt_off0001a4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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