Malicious PDF — malware analysis report

Static analysis result for SHA-256 321a26231e34b887…

MALICIOUS

PDF

77.8 KB Created: 2021-09-24 16:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 559a90bc361ba3ebc4cb741036f0b442 SHA-1: 3a34dc66b6679493a0d70c423e8e72cae131cd97 SHA-256: 321a26231e34b88773cbc85b7a3999427c9f4936e46b9de41a05f2233b588f27
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 compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristics and URLs point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://jplus-ag.com/upload/files/BodyFile__6130B2444B3F4.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614163a699d4d---54471885910.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/nofuwelilifojo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/09c5fc3032fbb8360aa98ef8e28313f7/34906147803.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/timebanepaje.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/xumataze.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/51531938706.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/pexolomebunuw.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf9fa2783---64072188134.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/50477646244.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/wanoxasedibevuju.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613699db140af---85575484796.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/40599273633.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/74092380636.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/18894829553.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fce862cc2---nobedoxabepajepale.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/veperidijisej.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-20/20210920103405563642.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/xepizojakaxexojeno.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/mofena.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/12/29322019264.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/jexudeguxakulijomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vpn+premium+apk+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4ED 10404 bytes
SHA-256: 73f588b07fe68c37ca981d405abad49fa6006afb8d69bcbf56dcf5a5db0de923
font_01_sfnt_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 18192 bytes
SHA-256: 2d771f62e1ed05a7d180c5a6a878a0153f73571721070f221c394abbe297fd9c
font_02_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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