Malicious PDF — malware analysis report

Static analysis result for SHA-256 949723cf99d8199e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 06:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12431d1c05c93ead2306b07758f9a075 SHA-1: d80a6c3f46fe06f08d7d9d7895324a57a16cad6c SHA-256: 949723cf99d8199e36008c185b015925897136939a8e714d97b6be8ba475a448
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=go+goa+gone+torrent+download
    • https://alhasooncorp.com/Files/files/3954445579.pdf
    • http://mptech.vn/ckfinder/userfiles/files/4227651390.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/pujudabufizaragofujiz.pdf
    • http://pollackmihalyiskola.hu/ckfinder/userfiles/files/penenorapaliko.pdf
    • https://caror.hu/ckfinder/userfiles/files/12205126058.pdf
    • https://dazhonghua1688.com/ckfinder/userfiles/files/futotupolane.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/79563743394.pdf
    • https://trvstore.com/userfiles/file/78565242305.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48d16705e---14165011339.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbddc10830---3839657201.pdf
    • http://arabic.cz/ckfinder/userfiles/files/nepiputajizixu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/35053a6c51598d4cb0a1dd3501f30abe/warulegedubux.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161392c8d33155---14256369879.pdf
    • http://toanthinh.vn/webroot/img/files/duredopabepixuvafasa.pdf
    • https://paron-rebondir.com/uploads/files/fonepewunik.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/sapepe.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/jijaledaxud.pdf
    • http://vector-mebel.ru/uploads/files/41098215989.pdf
    • https://egyediajandekotletek.hu/mvc/userfiles/file/silebafidejudupufu.pdf
    • http://pickup-ws.com/userfiles/files/wixukatafonenilojepu.pdf
    • https://haisanquangninh.org/data/dulieu/files/nuvorikumixuzobik.pdf
    • https://ecoolteh.eu/galeria/file/86056405999.pdf
    • http://www.gc-antey.ru/ckfinder/userfiles/files/23255434499.pdf
    • http://boschvietnam.vn/files/usersfiles/files/zowod.pdf
    • 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_off0000b967.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 16792 bytes
font_01_sfnt_off0000d17e.bin
7a70069ccf2e738da2d18f0c954a7f840d01481b647a0c3961dcb90559a408d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 10288 bytes
font_02_sfnt_off0000e8ab.bin
a7fcdf2292869cfed8801de2864a49d70e93161a540e8f141aa11b21064d15b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 16964 bytes