Malicious PDF — malware analysis report

Static analysis result for SHA-256 28090ae81ed80742…

MALICIOUS

PDF

106.2 KB Created: 2021-08-21 11:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dd27d54b597337376d4fc246e551724 SHA-1: 94d9edddaae0bfd977f5d573f790e4a21e8c3c58 SHA-256: 28090ae81ed8074253dac75eb38bb0320addb46fc8412a44d574ca0e36c344b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=timex+perpetual+calendar+watch+setting+instructions
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3e233eaf87bf85b10e18f1c87877f02/kamezawefinofanut.pdf
    • http://cuahuyhoang.com/media/ftp/file/vapanobilukivolafaxumaliv.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c030d48b05d19aa8480216ea1046425d/82523367690.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/57651063177.pdf
    • http://yaeram.com/userData/board/file/fimaka.pdf
    • http://orderkai.com/uploads/files/19920988305.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/ponegodiz.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/18872641040.pdf
    • http://kozelskadm.ru/files/uploads/files/penuno.pdf
    • http://schodylux.pl/userfiles/file/98762329643.pdf
    • http://pnlestari.com/visitbali/image/files/jetasafeto.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3fsgkn041jsm79872kpjhj6gd1/nesazamolekafovilarazip.pdf
    • https://dermatologie-chamonix.com/userfiles/file/71380597929.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ead8eb1eafbfbf8336de65f7363782c9/fibut.pdf
    • http://chupanhnoithat.vn/upload/files/kinikusiwesude.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb92b63cb---zikawopovubejudurizovono.pdf
    • http://dopuskvsro.ru/UserFiles/35773164067.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdd4ca4a78---65359870470.pdf
    • http://plusk-car.com/js/upload/files/togajekebijiforuwemubode.pdf
    • http://alfavit.tv/userfiles/file/tevinofowalezabes.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/95623125306.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oe08ro54tcum9vb1642fia0oh9/novapomarigakugirarobi.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d2bbef51---92678494397.pdf
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/3205030861.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_off00013792.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 16792 bytes
font_01_sfnt_off00014fa4.bin
da6641df4e6006c49b4e40560452ab21d096f14ca12c79c21733bbbcc3c3a3dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA4 18060 bytes
font_02_sfnt_off00017e58.bin
ca2f6afcaaf4b285c6e03eb73aca541280ee11522c7376a79ba27c9b66398a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E58 11212 bytes