Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9df8a9d746e0da6…

MALICIOUS

PDF

123.1 KB Created: 2021-09-19 11:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30762a0553016130669b8a3e7b073ce4 SHA-1: 83eed2260ed13e7d33329be057aa6ce021df3720 SHA-256: d9df8a9d746e0da6e16a3799c75e1fd107e578c0045bd1e8bb27c57651348ada
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://qianshunqs.com/admin/upload/pobodi.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/lk39a2jjqs0ebqkrqkuv3vb5pl/68542666051.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d888b43d4---wiwikanawebodidazilemij.pdf
    • http://permagnet.com/upload_files/file/2109110403113857979m8i21.pdf
    • http://tv-sat.cz/userfiles/file/55808460738.pdf
    • http://kwartetproforma.com/userfiles/file/21861783687.pdf
    • https://toolsatool.com/userfiles/files/73826985534.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/rakenosiziluxorir.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca13326f0---73150790100.pdf
    • http://amongelite.com/ci/userfiles/files/medemuboguli.pdf
    • https://aradmissions.com/ci/userfiles/files/wejati.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9d0bd7a1---94055518521.pdf
    • https://patc.fr/imagesfile/vapepetixagalafam.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/leludidikubeb.pdf
    • http://rsst77.ru/upload/files/90217841999.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/jepezonadebajisesuwujobaj.pdf
    • https://dukra.sk/editor_uploads/files/julijijelusidejijunawaw.pdf
    • https://angkaganjil.com/contents/files/59524944496.pdf
    • https://myphambambi.com/webroot/img/files/95335423525.pdf
    • https://arch.ua/ckfinder/userfiles/files/98723619668.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/74468749554.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7ed5a10605b725794230dcb088822957/munibado.pdf
    • http://daltan.hu/userfiles/file/45825116847.pdf
    • http://sjzhtchem.com/upload/files/4731794787.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=percy+jackson+full+book+series+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017922.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17922 16792 bytes
font_01_sfnt_off00019139.bin
df44980642ed946c24f3f083b4eaee6e973c7918aa17d81625c3c193894fb79a
pdf-font-stream PDF embedded font (sfnt) at offset 0x19139 11092 bytes
font_02_sfnt_off0001aaef.bin
322048ba3a3a669a1454696094c9952423d116240d4c47b8038f8efb602a4671
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAEF 19684 bytes