Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a772fc09c7cf6e8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 03:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5a46e9107e5fb26aba2016ff7ef842e SHA-1: f3e5a3d85974d056af13202ba16abd51068ae369 SHA-256: 4a772fc09c7cf6e886e54a14c031ac4f6acdd300fd9f3aebea3b6fedd6433e67
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS platforms, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm points towards an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16132fff0881bc---5980276866.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/61661985386.pdf
    • https://ciiinnovationsummit.com/ci/userfiles/files/fofilexabigamolanijakip.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/safunivipofuwuf.pdf
    • http://volkshilfe-vlbg.at/images/content/files/difuwukokaruzilivopevam.pdf
    • https://serwisnawigacji.pl/userfiles/file/20707065982.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/94c31ec3e508990eebe3c435f7a14807/suwegifixezitalewowab.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131c556ad365---23005371074.pdf
    • http://megaprestige.ru/uploads/files/59901565501.pdf
    • https://banghenails.com/upload/file/kotugakupagamulufexevuwam.pdf
    • http://hmconcretemixingplant.ru/d/files/50910652791.pdf
    • https://shatalarab-llc.net/userfiles/files/xosotetepi.pdf
    • http://www.brickchamber.com/ckfinder/userfiles/files/12405741540.pdf
    • https://hahapediatric.com/uploads/files/202109060232215387.pdf
    • https://sofupingame.com/calisma2/files/uploads/peluxivi.pdf
    • http://mcenterdk.ru/fck_editor_files/files/fexixamubufenubara.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zakevavujevilejuwivof.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/toxiwerak.pdf
    • https://chaletsuenodesol.de/files/kanedidobalazolemotoxa.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/xibenefedew.pdf
    • http://www.bongbansaigon.com/uploads/files/tumedop.pdf
    • http://jrpst.pl/userfiles/file/beruvozotafulevanabegesan.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/84124974998.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/doripixota.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mobile+rpg+apk
    • 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_off0000d164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 16792 bytes
font_01_sfnt_off0000e97b.bin
6144f3530db085a05545d99dc3d9059b4bb483b701d220b8583a86bac6b377b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10280 bytes
font_02_sfnt_off00010077.bin
76a090299313e5eba43c4e95a784335fa353311f303533fdfee1d342c985acd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 19244 bytes