Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c059852bf564fc…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 04:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d23cd80fc4e010f7a45716ea329f3e3 SHA-1: ffd6fcb725a2a8f5c7506ffa7b2e9e00abfc93f0 SHA-256: 35c059852bf564fc688d8b690028543ac0fb6677c5d26ca8bf7b5d7def36fe6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://hurtglass.pl/upload/file/lepasu.pdf In PDF document text
    • http://wtmongolia.com/materials/file/bepulosunepix.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fcb35d9369d8960c911d16e3fdf8008e/gosipexifurovej.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/kelaxubet.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/89847187865.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a7a48455---wewewovejugebajuli.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/14532314550.pdfIn PDF document text
    • http://wdnederland.nl/file/zikofukab.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/7296052131.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/tozadopujobivegabaseroz.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/wasobazufudoboligopex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a9e9801f---69430167506.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/403cab77a6f3da04ba1d812f14f2e1b5/zunafetowijonox.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/57048822797.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/lanavof.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/78061535321.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/xizozalekixugelulobu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/57500920014.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210922_5700F809A86D6EC4.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fp3r5lett50nsjudanpl3ie7rc/fibojuwu.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/kizofekamejinowurutusi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/95391683097.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/44097161755.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/vewivodeligamiwelotizof.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d27cb2474---teverebivagefimuru.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109090559354651.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/7134370785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=robux+calc+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 16672 bytes
SHA-256: 037a79f5b9ab55b9a61d1563ad01254fca3b8aa772f4ee06eb9b426fc823e91c
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 10584 bytes
SHA-256: 624ebc82fc1357653e20b4b300a1110f92eca89382a19dca8480ab451547a993
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1