Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9b0a1cb1093554…

MALICIOUS

PDF

76.7 KB Created: 2021-09-27 09:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c83909bd9ff94a389a32eee94527110a SHA-1: b1b1e448b164757d5a19fe6aefc255373e8f1d21 SHA-256: 2f9b0a1cb1093554bfea2c5c7acc8e7ea0fe20fd74b89ace829d853ffb65c30f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links are likely intended to redirect users to download malicious payloads, as indicated by the ClamAV detection and ML classifier. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=gta+v+ppsspp+zip+file PDF link annotation
    • http://ikuma-car.com/js/upload/files/kuketifisidu.pdfIn PDF document text
    • http://glassick.com/userfiles/file/notetem.pdfIn PDF document text
    • http://chpcentre.com/files/file/jelomoti.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c30ae8c3e2---xalesofilonevibukudo.pdfIn PDF document text
    • http://mfcpavpos.ru/file/kologoro.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/36590676013.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/40e5804010e039148933bda7338bcf15/nikazorusuge.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/83938789094.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/48517784178.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904061513787264.pdfIn PDF document text
    • http://prosquash.by/data/bewavipetowobigopo.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109131747041066.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/seluvafibogugurujulesu.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/69403428900.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614977790544a---vafukulimuguzajubebixuvo.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109122306511273.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161425dec8636c---perifelusuxikuzokum.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/devuvubuxelupuju.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc2ea1e88c---62035941202.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/sasafixujixebawuv.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/22678818889.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/dadibidonemovute.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/zovikenamafilepimolisug.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/litemorege.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91604711558.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/libupakedosigewudota.pdfIn PDF document text
    • 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_off0000c212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC212 10192 bytes
SHA-256: 8e75dc78378af20ac58c64dbfeca741adb50a3f4e4436f962c97c858703b1562
font_01_sfnt_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 20488 bytes
SHA-256: e25c2ec00f907a56386bb39118738cec0fc87b297cee06091046efa1a52908b2

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