Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffefcf9c862389e…

MALICIOUS

PDF

88.5 KB Created: 2021-08-16 23:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cc7c8db18e8cf7dc52d5e2386711fe16 SHA-1: 214680d1761d384862c3219237be7d89f05fc507 SHA-256: 4ffefcf9c862389e9a5386f49b6dd91d85a9198dfc49ffcbf8cbb75c263e0ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs that point to compromised websites, likely serving as a link farm to distribute further malicious content or phish for user credentials. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=last+day+on+earth+survival+hack+ios+2020 PDF link annotation
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/29994570120.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4aab4d0aa1bc523110cef22a8dd3aa47/40655821483.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/19035769723.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/rujotulafijamejiwuvek.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16115240b938d4---6708454787.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/pomonejaxazexo.pdfIn PDF document text
    • http://htygroup.com/upload/files/82439391376.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fee45a72c---rifixorexisibarodina.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5bed2d69---vatoserevi.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/vidizaxejeru.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/lq95f7nmoro02fp5alcki92aeo/zowefadunejemavapewiva.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0955e553edaff5a1989a9355d1181a57/bovefajozovolawulu.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/suzetodobunavanofujitab.pdfIn PDF document text
    • http://usa-ex.com/napazanosobiwolifirisow.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f41fea6a150993eff4dfb88214c7926f/rogejat.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/27630130311.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/39292956103.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/57dcca8cb58a7ef6ba72759b0cbd11ef/22761978622.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/lisolofilufopezirazug.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210801123139_lhhjxb.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/natabixi.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/lifumak.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/64b33d0d7b4cd37a56f0f5e4ed8462be/runovi.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/revenadek.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079981f2c708---duzikubisudageworogawu.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 18180 bytes
SHA-256: d2f27a9adb9adb7f82ec1cd8f1cede4435201343c22272dd3fb3023f985e4c32
font_02_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 11036 bytes
SHA-256: a3eb31033fc5458007774abc451201a49006d8a8f8ef023efac355c675da56cd

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