Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aeae51e7580b05…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 04:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30923b6795b52566bca03bd03ccdc122 SHA-1: 37e3cc88df433c0a282c98aa431839a1821c3872 SHA-256: a6aeae51e7580b0534be004d8fda7cf73964ceaa011b35e2f831c7d7dbd42bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and link farm structure indicate an attempt to trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vleek.com/uploads/files/87469769696.pdf
    • http://mengnuanua.com/app/webroot/files/files/xatejudi.pdf
    • https://bselink.com/userfiles/file/35416839029.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614670b853497---bidufa.pdf
    • http://uslugi-ogrodnicze.pl/pliki/File/21807028959.pdf
    • http://goang-hann.com/uploads/files/202109071627598024.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c0421820c8849af1980685cd81be5142/tobifupepadetupofiw.pdf
    • http://biznesfishki.ru/files/userfiles/files/xigukiwa.pdf
    • http://dentistturkey.com/image/files/xozalu.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/fatategowusufolugubuw.pdf
    • https://kovrdom.ru/sites/all/sites/default/files/file/nubefizapawatat.pdf
    • http://dh-life.com/ckfinder/userfiles/files/1324456101.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/49998110674.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pujolelelativokiramibus.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7dd6ea57a461c75d078df5c3f1d629b9/35620409078.pdf
    • http://neza.cz/UserFiles/File/34570905422.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3ffbb791d401515adcb84726d2cb029e/84666674997.pdf
    • http://targhevaticane.it/userfiles/files/80468671024.pdf
    • http://lamekatus.com/uploads/ckeditor/files/nazaferezovamoguj.pdf
    • http://zl369.net/userfiles/file/pajidadefox.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fc77134d2---puzinijisometim.pdf
    • http://bitite.lv/media/txt/122/file/zidifidusonij.pdf
    • http://cerritos.songhakbbq.com/uploads/files/najozetawijumozix.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131907585429---81967415319.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/934dd8f39cf4165ed243994090fdf809/82909828990.pdf
    • http://villacappuccina.com/userfiles/files/kipikexarorika.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=xiaomi+android+11+bugs
    • 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_off0000cfdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 16792 bytes
font_01_sfnt_off0000e7f1.bin
0ff332b6529e9868da5c6217618593b6c8e4f1028a9e0d3bb92b4b40fd1b3d12
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 17516 bytes
font_02_sfnt_off0001155a.bin
5c141f04006696e659117bd427278f740ff72dfcbae5bd7ab9d725111481ca84
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 10612 bytes