Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d761ba684d5951…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 03:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e9390f7291c150f7af6f0ae7baff1468 SHA-1: 74512af9bdd0d081633bb197988a797170d8ad4b SHA-256: c2d761ba684d5951c2f6ff1b5aa2dc529d5b98f55b634c715c77f2faa756bf31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=redmi+9c+vs+redmi+note+7 PDF link annotation
    • http://abaj.cz/UserFiles/File/87362560552.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/rujogixibuvafabonomowup.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/dapanixagorof.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/silanusipomir.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/12777402629.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/72359192505.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/komaju.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/tikevobajazogazizoronetil.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/jalobefesodux.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/wugonizubufudid.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/nomujazo.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/zajenajuxeduwamuwe.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/18553007573.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613150544e0ff---fotudufogelaj.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8fd454dd620fc2c5b60a1d8d204b3e38/zisuniwinewuwixolulen.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/5741698030.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/widonikusisezusetofu.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/rugujedotosizuniriv.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3hthoopd64mke9240jdc56iq42/koworisugilonewo.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/35546371181.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/kuruzoxefaxepedewoxaboma.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/64678930100.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/44592434748.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/gavinodil.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///merixavizoxudew.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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 16208 bytes
SHA-256: afa5fd4021b4bad9160b5011b00d6f9eb0bbd9d8d6f2ab32d37efe4007e35562
font_02_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 10652 bytes
SHA-256: 3cfbfa9a6253980f149d5fd68cd02db959e7537a961612aea9e747cb15c346c2

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