Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68c730c3b559dda…

MALICIOUS

PDF

72.7 KB Created: 2021-06-30 21:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3fe0db3e7b03725df1b102b8ad5ee1d SHA-1: 5ab3696f2de8c2f5c4d4ea52b6a61605590a508b SHA-256: f68c730c3b559dda8642f637ff619e202c5bfc8e496aeeeb8da8c4ddbe2d82e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1c6a1f19acf6180c2e097d40d9490775/nupodizonefiguv.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb2399f8c---vuderorulofunupixupove.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjvkbp4roaqsi93svgtrpvgk8i/24767445552.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c79c015d78d0a2e3f0557e9f0da90e83/76773758075.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fp6tn6mpe9tbbl8cq055doj9m7/44788688343.pdf
    • http://aaaexpressheating.com/userfiles/file/lipuxilax.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4e766a8b1752cc53f104c086cfc6850/gevupijonamidotoxafar.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a23409dfcbe9da6a60c926e893752996/sukevozakulajizavawokoti.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609800a51bd8f---44206952134.pdf
    • http://klefmarken.se/upload/file/38408544125.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097e6ed6a30c---78027576236.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/wabatofawu.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t69ig9p0ep43rtuuah0g7ua0j1/44045310941.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160866218c888d---nenefuwerofomeg.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/73effe80de3c1e60cd07892206bc6ff1/kagemasakefabevulosari.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8957b7fb7---38083744135.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/denesofebopadiwalavukasu.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/84910e7cec07c940d822e9e453d3129d/62703270694.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/inrk840rg49k38396dnhafahu2/7466113931.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1rmdlvgbddc3eut087o39jjpk8/54515153928.pdf
    • http://pitin-akutsu.com/js/upload/files/88785674718.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/stj7ev73edu9dhmrp1d8gnu1h5/16851408230.pdf
    • http://banphimchuot.com/userfiles/file/tifuvitorilowapepinexibu.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/76433560162.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+water+cycle+crossword+answers
    • 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_off0000bcd6.bin
f4037b8856be35b0902d77954a456c085011bed1a0502f8cdf8e38cb5fd6acc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD6 15772 bytes
font_01_sfnt_off0000e576.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 16792 bytes
font_02_sfnt_off0000fd8d.bin
256b0544e9afe8c6ca265a62c74f2b28e38efd17bb596fd9492a3b7964b1854f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 10540 bytes