Malicious PDF — malware analysis report

Static analysis result for SHA-256 a997210ff24d186f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 11:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2eb5d19c93dfe5e4274c3d8c23421a09 SHA-1: c34d0615396732d8b98d62956e7f62c93ff7c4b1 SHA-256: a997210ff24d186f071a48da5ebed0547479f522d421294290c96fad88de604c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt.

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://kondicionery-elektrostal.ru/upload_picture/file/mirabirezupeputij.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/78d575fde73d40285f78d9043208c6e3/voxupobulabagiw.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/10324e0c39d54b980314fb1fed4f86fc/67096811255.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec3713bee---64489831679.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/24878049317.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/98860365097.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/pezefexokuruli.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/xuvurusesowupef.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/79494256367.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/80659783513.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/viguz.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210913190314.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/sujosifajunot.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/73123019963.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/60572935203.pdfIn PDF document text
    • http://belv.ru/userfiles/file/91666909026.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/46917489702.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/100686184613716b589d97.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/gorivom.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/9491388675.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mesepajonepe.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/gozebajakefisedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=droid+transfer+downloadPDF 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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 17708 bytes
SHA-256: 10c2f9a00c68d690c4041dbc0ff2fd84de7dd317519e744bee448b2189dda7ce
font_02_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 10432 bytes
SHA-256: fe953508746c0297a1b87fe51038bdf044113c436608832c65cf48179e8403e3