Malicious PDF — malware analysis report

Static analysis result for SHA-256 f368a0b13a22e9a8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 00:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a47096d8e57ab03215202bfffb773682 SHA-1: 77fe601dd1ba3637d687e1fb35a6628b349c22fe SHA-256: f368a0b13a22e9a85fa3981b331799cedb79ac05c9ca651b724549aaa1d1f6cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm used for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49850155441.pdf
    • https://alice-immo.com/userfiles/file/jakosupatusigodujunurow.pdf
    • https://webmakler.org/userfiles/file/kifinarobeku.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3e248326b36c54cf6051016d636fee70/11518601071.pdf
    • https://valgott.com/images/userfiles/file/ralutiro.pdf
    • http://szakkepzosiklos.hu/upload/file/mejuvudogizeja.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/981b016b9bd0a00be122af4665243344/67728300534.pdf
    • https://fluffy-chins.com/images/file/81752031913.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/33186690845.pdf
    • http://cdio.vn/uploads/userfiles/file/mujilo.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/37027380185.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/dokitolegetorobime.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161327d44952c2---dosidesesekesogagebomusu.pdf
    • https://lotteppta.com/beta/assets/file/46055339907.pdf
    • https://xanbiente.de/userfiles/file/36417795668.pdf
    • http://posekatzahradu.cz/files/file/20825322973.pdf
    • http://www.farnostbobrova.cz/ckfinder/files/xupaxowopezu.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/vusaz.pdf
    • https://habibitours.org/ckfinder/userfiles/files/xegivixudexuvipidubax.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/792ca29b72642efd4e5c6c0cb0679afd/14400084624.pdf
    • https://locoffice.ru/userfiles/file/kapadumonebepojo.pdf
    • http://limeitec.com/upfiles/editor/files/mawidadu.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/29822652685.pdf
    • https://emilline.dk/ckfinder/userfiles/files/9447451189.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+send+an+app+from+phone+to+laptop
    • 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_off0000df75.bin
58ce4a758fec2736f3b64c88c58f14eeade65e64c466b582387e2786c7259ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10748 bytes
font_01_sfnt_off0000f802.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 16792 bytes
font_02_sfnt_off00011014.bin
c9e7bcf90cb37a25ed3d51b5274d9fd9b735ffadbe2ffdaeee19a8afadf3a9bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 17220 bytes