Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c217595b7d1ef6a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-29 04:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 27fda131477806bf34c44a8958587ae2 SHA-1: f661f020528db3cb1b4d0d84acd96ec635afc76e SHA-256: 2c217595b7d1ef6abcd1358593bec6549f9c7c2991b14b3d85ec72c5c72b1dcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a large number of external URLs, many pointing to compromised WordPress sites. This indicates the PDF is likely used to redirect users to malicious websites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://medvor.ru/uplcv?utm_term=can+i+use+switch+pro+controller+on+android PDF link annotation
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxavavotubevuju.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c8d9c930dbf2a57398d9bb465e671876/97337271918.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/31239083367.pdfIn PDF document text
    • https://la-klamm.org/Files/files/sajobis.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351f61469af---nuwireparijugunimugog.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/65ad84eec82b472c488103892babed8a/72043299793.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/vovotavumoxukokibipip.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a11bbcd43---kovuvevuxuduvipexugi.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sarazix.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/13651295084.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/guzifenotedar.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16151a98473946---62600707792.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210919_33F3B705B47DB4CB.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pawuvivagogewafewove.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/13616907307.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/zoderutomut.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/depixakodekukapetiruzidum.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7092b8b69424e6229858dd41913d8fbb/95732872111.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/28413510185.pdfIn PDF document text
    • https://titishop.co/upload/files/dojagezesav.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/bozikenigaxugimeku.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/95465714976.pdfIn PDF document text
    • https://edusfera.pl/upload/file/doripofivim.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/58109155705.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/4941668419.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/puxagikediwu.pdfIn PDF document text
    • http://videocycling.info/files/file/31832236876.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/63807057597.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_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 19096 bytes
SHA-256: cec8cf31d4d342406342752c21fe4b3346a2d8583421d822a4fbebd5f1a05114
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 10828 bytes
SHA-256: ade2a28fb4fbc266e5377b1cf8660ba1cc64dfc6c47a5f2e8ae14cf27585cf3f
font_02_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1