Malicious PDF — malware analysis report

Static analysis result for SHA-256 de882a656b76f424…

MALICIOUS

PDF

69.7 KB Created: 2021-09-12 16:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 306217c7e683c09bd63ed1a250701e89 SHA-1: c97bc875553f31ae6f3a6f159dd4df0faaebf675 SHA-256: de882a656b76f424be994401ec020f88969f731fe3b1649fcb7c2421e85c5a2e
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 disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ned.ru/uploads/files/zulewuxabometolepalipagu.pdf In PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/12286084410.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/xiser.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4dc4579929f0738b1d0f7ba2edf1dfdf/balatulajogegubud.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///48028080039.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130672722822---74121168634.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/94400016230.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/beverapakerimumujexexe.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/sojikodewuverilaxejo.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/95415416393.pdfIn PDF document text
    • https://limsurempat.com/contents/files/favovivudofelo.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/volaxunoseb.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/sepekidunetilokazo.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/73092781101.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/tubedifovimetivut.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/es3rn5a95q4uik0t258a1oso46/66712416753.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fozifojuduvogibuvimopot.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fdd8ef243---61985956455.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/jipuju.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/94969859760.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b947999bed---17188155210.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/95032601823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fs19+no+verification+apkPDF 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_off0000ae89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69B 15776 bytes
SHA-256: 0c1f4a750b213186a9ff34c7c40acf4c6e8d2a468a5fdcc5d0d173d58da92779
font_02_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10784 bytes
SHA-256: 1e46678b3ff8c0dd37aefe6c5d535c09c507b0a7e5884e0544806b96dd64ee54

Open this report in the interactive analyzer, or submit your own file for analysis.