Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff61e23ef41fbc8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 02:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae2ec2cea0f7a1c0c849289a4519f40e SHA-1: 5603ee7d92b807697d59ae3683c701ad6b1e844f SHA-256: aff61e23ef41fbc8e21fbcf0f2d1a6f9e3d0c81f56ce07861ba16953f04eb7e3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The presence of multiple embedded URLs and the nature of the heuristics indicate a likely phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/gitamirepedozawiw.pdf In PDF document text
    • https://coonvalleycc.com/userfiles/file/jiligukizevafoxijif.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ad540c6c5c7883bb24a61ac05dd61be1/95155079620.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b23720f829---mufivoxisizudujuvow.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/53024872739.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/6089552202.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/47279225924.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jukafinudelazaxe.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/25537914659.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/foteril.pdfIn PDF document text
    • http://risme.vn/files/78627699870.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wudovo.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/lurepikokovokofawafepa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/tasupuresiju.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/86540242423.pdfIn PDF document text
    • https://mmszke.hu/files/file/53831078342.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/92639368591.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/voboxa.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/31405083752.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2965c2124160231a702a57240aa7e900/86206638581.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161311eaa9a0de---bajupevozo.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/32117600167.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/duzinavuv.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/73697626898.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8dc353ca0---xivuzadu.pdfIn PDF document text
    • https://luminex.pl/upload/file/suxen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+v+apk+2020PDF 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_off0000b3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 9924 bytes
SHA-256: e9a34a078213bab85eb7e4877b084fc04a1c94534270df027c4a0d013b58f4db
font_01_sfnt_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 16324 bytes
SHA-256: f0d248479b44f1ee2d74c8a7881ef39bb53b572ab85a29d0101d5b1d8789b5b6

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