Malicious PDF — malware analysis report

Static analysis result for SHA-256 777994ab48d31963…

MALICIOUS

PDF

152.0 KB Created: 2021-09-01 16:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6ffe146a6c9ccc0604f1e614766a416 SHA-1: 6a8d39a30af42f1168cf280daef6e57a5e85d4b1 SHA-256: 777994ab48d31963cea39642a0a87015f43db1964ce92419b5f5a14806548063
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://nsck-cykelmotion.dk/userfiles/file/wonukoliwib.pdf In PDF document text
    • http://stoewebdesign.no/userfiles/file/48103144062.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gerijupumewanalusepiz.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/babaladogiwiwufowewapen.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5ebceccc2f179d4b31bd1ac828515cc/8890690058.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/aa49dcc359125085884e5b860e793a65/77104391612.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pebamalomejivilari.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/ridirokonakafo.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/lezuzunuzuzeno.pdfIn PDF document text
    • http://coachhouse.info/assets/file/tujuzi.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/roxogawisaxukuvegifus.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/kipipilenunibapalejasez.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/8e3c02c962e7e2f863d5fdfc802ec7a3/mawaputevokuritipazeki.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/76776393367.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/vesotijasejexe.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8cd6cb31b674def59959c83a3849b07a/44580571377.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ed5480ee2ad7da5f3113a1e00cab70a6/61689182999.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/77b0eb2093f36e64f4195b986db565b0/rajazavulib.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/5613022113.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5ca53bec---zuwanowopiwolijovali.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/38901291002.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/06a32f65cb9fcf4d162696384652407f/bovipedo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sejidilotorojapufiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tell+me+about+mongoliaPDF 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

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_off0001e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB29 10388 bytes
SHA-256: f2335657e2a3064fe19c1ac8a765f12818ec33d0de4e2c6cb5e5ad2241dbe2e7
font_02_sfnt_off00021297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21297 24388 bytes
SHA-256: a5eff04879c4d00fa882c3c1709f96f39d47f3e66375f2221b8bcf6626bb5d36

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